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Si I looked at your page on my Windows 2000 + IE 5 machine - and was surprised to see that the page was rendered in Thai - checked your eot - still broken - still contains the wrong allowed roots.
So what's going on? I saved your page to my desktop and removed the refs to your fonts - eot linking CSS and the FONT FACE declaration. Hit refresh and the page still appeared in Thai - so my guess is that IE spots that the page is Thai encoded and decides to use the default Thai font to render the text (see attached screen capture). Looks like Microsoft Sans Serif to me - could be Tahoma, the other common font that includes Thai.
So I'd still be interested to see the page using your font.
Cheers, Si