Thailand has approved a new constitution. In a referendum citizens voted in favour of the amendments presented by the military.
A concise useful briefing to the referendum is provided on the Guardian website
IFES also has some basic background
Official information is on the Thailand Electoral Authority website. Although at present English is limited.
Analysis of the content of the new constitution is on the Global Legal Monitor site of the Library of Congress
Anfrel (Asian Network for Free Elections) has a copy in English of the voting procedure booklet for citizens.
It also has a country profile with links to relevant legislation and electoral resources for Thailand.
The Nation has news stories in English
Background information on human rights in the region
Try Amnesty International.
Thailand Office conducts work in Thailand its website has discussion on the state of rights