Here is a web site that is selling Thai-English language software. It is intended to teach Thai to English speakers.
Thai Culture Publishing
The software is good, but the "disadvantage" is that when one installs the CD, then the software requries a massive download from the web to update and operate fully. This is not a problem if one has DSL, but I think for a dial up connection, it might be a bit slow for the full installation to complete (although it will function on a partial download - the database just won't be fully populated).
For those who can already read and speak Thai, it is likely too basic.
I have no financial affiliation, but I confess that I do know the falang male who is developing the software. He is asking $25 US for the software (he didn't listen to my advice to charge more). I ordered (and paid) for 3 copies (one for myself, and two that my wife plans to give away to some Thai friends here in Germany (for their husbands)).
Apologies if anyone considers this spam. I can delete this post if this is offensive.