UPDATE: The Bangkok Post has a summary.
In regards to Preah Vihear, the International Court of Justice (ICJ) issued two judgments.
First, in its judgment of 26 May 1961 (PDF) the Court “upheld its jurisdiction to adjudicate upon the dispute” which it described in the following terms:
“In the present case, Cambodia alleges a violation on the part of Thailand of Cambodia’s territorial sovereignty over the region of the Temple of Preah Vihear and its precincts. Thailand replies by affirming that the area in question lies on the Thai side of the common frontier between the two countries, and is under the sovereignty of Thailand. This is a dispute about territorial sovereignty.”
BP: This was because Thailand had accepted Compulsory Jurisdiction under Article 36(2).
Second, the judgment of 15 June 1962 (PDF) dealt with the substance. Some screenshots from “Case Concerning the Temple of Preah Vihear” (Cambodia v. Thailand), Covey Oliver, The American Journal of International Law, Vol. 56, No. 4 (Oct., 1962), pp. 1033-1053 from pages 1044 and 1046 respectively (click on images for a more readable version)


Selected excerpts:
“The Court however considers that Thailand in 1908-1909 did accept the Annex I map as representing the outcome of the work of delimitation, and hence recognized the line on that map as being the frontier line, the effect of which is to situate Preah Pihear in Cambodian territory”
“FOR THESE REASONS, THE COURT,
by nine votes to three,
Finds that the temple of Preah Vihear is situated in territory under the sovereignty of Cambodia
by nine votes to three,
that Thailand is under an obligation to withdraw any military any military or police forces, or other guards or keepers, stationed by her at the Temple, or in its vicinity on Cambodian territory;”
Article 60 of the ICJ Statute, stipulates the following:
The judgment is final and without appeal.
Article 61, paragraph 5:
No application for revision may be made after the lapse of ten years from the date of the judgment.
BP: Now, Thailand disputes whether the court decided on the 4.6km territory beyond Preah Vihear, but not Cambodia’s sovereignty of Preah Vihear.
A translation of a piece written by the Foreign Ministry published in Matichon in March 2008:
Recent media reports on the Temple of Preah Vihear have generated a wide ranging debate. Two issues in particular have been the subject of comments and criticism. First, some Cambodian media and Thai academics wonder why Thailand is attempting to block Cambodia’s application for the inscription of the Temple of Preah Vihear on the UNESCO World Heritage List given that the International Court of Justice ruled long ago that the Temple is situated in territory under the sovereignty of Cambodia. Second, some Thai media and members of the public fear that the successful inscription of the Preah Vihear Temple would result in loss of Thai territory in the areas in the vicinity of the Temple and wonder what the Government is doing on the matter.
The Temple of Preah Vihear holds an important place in the history of Thai-Cambodian relations as the title over the Temple was once the subject of a dispute between the two countries. The dispute, however, was settled by a result of a judgment of the International Court of Justice (ICJ) in The Hague, the Netherlands, on 15 June 1962, granting the title over the Temple to Cambodia. The Thai cabinet resolution of 1962 demonstrated her acceptance of the ICJ ruling. Therefore, the assumption implicit in the first question that Thailand does not accept Cambodia’s title over the Temple of Preah Vihear is categorically incorrect.
However, the ICJ did not decide on the exact location of the boundary line between Thailand and Cambodia in the area. The same cabinet resolution that accepted the ICJ’s ruling also reiterated Thailand’s understanding of the boundary line in the area. Then Foreign Minister Thanat Khoman also sent a Note to formally inform the United Nations in 1962 of Thailand’s acceptance of Cambodia’s title over the Temple building proper and the boundary line to which Thailand adheres. To date, Thailand still adheres to a different boundary line and a different map than that of Cambodia, resulting in overlapping territorial claims over the areas around the Temple of Preah Vihear.
…
The second question is whether Thailand will lose part of its territory as a result.
Up to this point, the process for the inscription of the Temple of Preah Vihear on the World Heritage List has not been finalized. Whether or not the Temple will be inscribed on the World Heritage List, the work of UNESCO and the World Heritage Committee are entirely unrelated to boundary issues. The Convention concerning the Protection of the World Cultural and Natural Heritage of 1972 specifically states: “The inclusion of a property situated in a territory, sovereignty or jurisdiction over which is claimed by more than one State shall in no way prejudice the rights of the parties to the dispute.” Furthermore, UNESCO and the World Heritage Committee themselves acknowledge that they do not have a mandate or authority regarding boundary matters, as they are interested in and responsible for cooperation on historical and cultural matters only.
Cambodia also confirms that the inscription of the Temple of Preah Vihear will not affect the boundary claims of both countries. During consultations at the prime ministerial level, between Mr. Samak Sundaravej and Somdech Akka Moha Sena Padei Techo HUN SEN on 3-4 March 2008, and at the foreign ministerial level, between Mr. Noppadon Pattama and Mr. Hor Namhong in Singpore on 20 February 2008, Cambodia sought Thailand’s support for the inscription of the Temple of Preah Vihear on the World Heritage List. Cambodia has given an assurance that the inscription will not affect the on-going demarcation works between the two countries. Furthermore, Cambodia’s Foreign Minister has also sent a letter confirming that the inscription will not be considered as demarcation of the land boundary between the two countries.

Last year, when Surayud was PM and during its 31st regular session held in Christchurch, New Zealand, from 23 June to 2 July 2007, the World Heritage Committee examined all the documents relating to the proposal to inscribe the Sacred Site of the Temple of Preah Vihear on the World Heritage List. The Committee first of all took note of the following statement made by the Chairman of the World Heritage Committee, approved by the delegation from Cambodia and the delegation from Thailand (PDF):
“The State Party of Cambodia and the State Party of Thailand are in full agreement that the Sacred Site of the Temple of Preah Vihear has Outstanding Universal Value and must be inscribed on the World Heritage List as soon as possible. Accordingly, Cambodia and Thailand agree that Cambodia will propose the site for formal inscription on the World Heritage List at the 32nd Session of the World Heritage Committee in 2008 with the active support of Thailand.”
BP: Evil Surayud! Is anyone unclear about this?