Hello!
Had quite well set up and nicely working 2008.0 system on my box, but due to need to repartition HD decided also to upgrade to Spring few weeks ago.
Bad idea - having used Mandrake/driva since 9.0 I haven't had a box hanging on a daily basis - and this one dies couple of times a day.
Hanging happens gradually and starts from the mouse (ordinary Logitech wheel mouse). In the only occasion when I waited until complete lockup imwheel was eating up most of the CPU, with X using what was left to it, so I guess mouse might be the source of the problems.
In fact, because I work a lot on a keyboard I do not notice always when it starts, just in one moment mouse pointer still moves, but clicking produces no result. Then usually window decorations get lost and while I am not completely sure of that, some keyboard shortcuts go with them. CPU usage is high, but not 100%.
At that point I usually restart X which solves the problem for a while.
Hardware
Dual Core Intel® Pentium® D CPU 2.8
Graphics GeForce 7300 GT
ImExPS/2 Logitech Wheel Mouse
