The creator of this site has the answer: http://www.twentynot2000.com/
Another good read is: http://www.dallasnews.com/sharedcont...1.4b9ca67.html
If asked to vote on this, I'm certain I would choose "twenty ten", because I think it rolls out much easier and also follows the pattern described in the first site above. But if I'm honest with myself, I think I've been saying "two thousand ten" all along. Maybe I'll need to retrain myself.