I'm one of those chickens who aren't upgrading yet. I just got the 9.2 kernel sources and compiled it to have it with my 9.1. Seems to work fine except for alsa. 9.1 uses 0.9.0rc8, and 9.2 is alsa0.9.6 so I guess there are compatibility issues which I am sure can be solved by doing some reading - I'm too lazy for that so for the moment I'll go back to oss which works fine. Insofar as the main benefit of 9.2 seems to be the kernel - for me at least - it might be worth giving it a shot for all those who don't want to do a full upgrade to 9.2.
: part of the sound problem was I had forgotten to compile the alsa sound module for my sound card. Stupid
I compiled it as a module and updated the alsa packages using the rpms on the 9.2 CDs (no big dependencies; locale files for some reason and gcc had to be updated) and now things work fine. A mix of 9.1 and 9.2. It could be that an update of the alsa packages wasn't necessary but it didn't hurt.