You have to configure the ALSA sound driver to work with 2.6 as the kernel now has ALSA built into the kernel as opposed to OSS. It's not as easy as installing the new kernel and hoping the sound will work... sadly
Search this board and you find multiple posts regarding this problem. From personal experience, It can be a royal pain in the a$$ to get sound to work with 2.6 (FC2 T1).
I'd stick with FC1 as sound works it most of the time "out of the box". You'll just have to run a bunch of updates (KDE, Xwindows, etc...)