Oh now it's been bumped I have to post again...
Toxic Holocaust released a new album this month, which I think is decent. Reminds me of old school thrash. Havok are also doing some thrash revival, their album Time is Up was released earlier this year, but they still need more exposure.
Thanks for the tip, I haven't kept up with TH. Loved Evil Never Dies so I'll check out their newest.
You ought to look into the band Vindicator - MA page - they've got some great thrash and put on an even better live show. Definitely worth seeing if they come out your way. They're the only thrash group I've seen that wasn't some huge name and was actually really really decent.