Here's a link to a comprehensive coverage of the Budget Airline situation in Thailand at the moment, without having to wade through pages and pages of ads.
http://www.dennh.com/1_Airlines/Budg...t_airlines.htm
There have been a couple of new players added during the last few weeks, and this list includes airlines which are based in Thailand and airlines which fly to Thailand.
Hope it's helpful.
Cheers
KM