The Economist has been running a series of very good articles about Thailand but are unavailable here because the hardcopy magazine is banned when addressing these topics.
A few of the Economist articles are online at:
Another good reference is Paul M. Handley's book "The King Never Smiles". It is also banned in Thailand. It is pretty biased but is very interesting in pointing out an alternate view of Thailand from what is put forth by the Thai government.
My impression of Thai politics is that Thaksin acted to break up Thailand’s oligopolies, and the oligopolists moved against him. Is that an accurate impression?