I'm kind of astonished to see so many people here running the flash plugin without a problem. Unless the definition of 'without a problem' changed somewhere.
I run it in Ubuntu (karmic, 64-bit) and it sure is the worst piece of shitware I got. Whenever I have a page with flash plugin, cpu stays fixed at 100% usage (well, at 25%, because luckily I'm on a quad-core). Also, the plugin segfaults more than my tests when I was learning assembly. After a few days turned on, last lines of my dmesg are always something like:
[562380.585402] npviewer.bin[8191]: segfault at ff999ed8 ip 00000000ff999ed8 sp 00000000ffe4d0ec error 14
[565094.972209] npviewer.bin[10145]: segfault at 1020000 ip 0000000001020000 sp 00000000ffc9727c error 14 in npviewer.bin[8048000+23000]
[572699.544263] npviewer.bin[11284]: segfault at ff999ea8 ip 00000000ff999ea8 sp 00000000fff58c0c error 14
[575806.593733] npviewer.bin[14840]: segfault at ff999ea8 ip 00000000ff999ea8 sp 00000000ffebc38c error 14
npviewer.bin is the flash plugin.
Really, am I the only one who has any problems with this? Sometimes, it even hangs firefox for several seconds before giving back control.