Firefox, pidgin, thunderbird, intelliJ, even emacs!!!, or perhaps it's gnome in general will periodically stop responding. All named except emacs tend to gray out while this freeze is happening.

opensuse 11.2

2.6.31.14-0.6-desktop #1 SMP PREEMPT 2010-12-10 11:18:32 +0100 x86_64 x86_64 x86_64 GNU/Linux

cpu: Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz

nothing obvious in the logs

Anyone else seeing this?