Firefox finally hit the 25% mark in the usage measurements over at w3Schools.com. This site is heavily trafficked by web developers (who themselves are usually power-users and often appreciate sophisticated features) so I'd expect the more capable browsers to be doing the best there.
Opera and IE have been in a pretty steady decline there as Firefox share grows. Both Opera and IE have lost about 20% of their constituency at w3schools in the last year and Gecko has more than doubled its usage in that same period.
