Re: Most annoying IE9 bugs so far
Sadly, IE9 seems to harbor to a number of bugs, some of the worst being in the way it handles CSS.
Like you, Eri, I find myself using Firefox with greater frequency. (I give Chrome a spin every now and then but Firefox still seems more mature.)
There's a couple of sites for companies with which I do business (not clients) that IE9 renders in an unusable fashion. It won't take much of that sort of thing to undermine IE9's usage stats.