I bet its custom. The font (typeface) detection util at http://www.whatthefont.com might be useful, or their forums.
I tried that earlier today. Their t's in particular are pretty crazy, and not from any common font, I don't think. Could easily be a custom job based on something like VAG rounded for the vowels, though.
I've always wondered about this. I think many automatically assume (falsely) that most "popular" companies buy or make custom fonts for their logos. I'm happy to realize that this isn't the case.