Discussing our budgets for next year at work, we seem to have fallen into saying 'two thousand and ten' but the London Olympics are definitely 'twenty-twelve'. Like #29 says though, I don't know what will happen in 2011.
Spoken, it will be "twenty ten". The years 2001-2009 were an oddity, and the odd pattern that they imposed won't go past this year.
Incidentally, how do you say the name of the movie 2010?

I don't talk about it, but I read it as 2 thousand 10. I suppose I'll get into the "twenty ten" groove sooner or later, probably around March or so.
The years 2001-2009 were an oddity, and the odd pattern that they imposed won't go past this year.
It depends on how you view the pattern. If you see "1995, 1996, ..." as 19-95, 19-96, ..., then 2010, 2011 would continue that pattern by being twenty-ten, twenty-eleven. (As you suggest.)
However, if you see nineteen-ninety-five as short for nineteen hundred ninety-five, dropping the "hundred" because it makes it too long, then the logical conclusion is that we will be counting "two-ten, two-eleven, two-twelve, ..." (dropping the "thousand" for the same reason), and a full return to the old pattern will not happen until 2101.
This is the "Speaking in Tongues" branch, is it not?
Yet we have a succession of posters putting their faith in the vernacular developing according to some hazy predetermined logic rather than evolving in its usual haphazard fashion!

Listening to BBC Radio 4 this morning, I heard someone talk about tax levels in twenty fifteen and someone else talking about food production in two thousand and eighteen. The jury is clearly still out...