I know the Grooveshark fans who are Linux users will appreciate the increased stability as well.
On Ubuntu 10.04 x64 Flash is pretty stable for me, except when I've got 40 Firefox tabs open (yes I'm seeing a therapist about that) and then try to run some Flash app that's more complex than a mere Youtube video. No more popping htop to manually kill nspluginwrapper that's in some kind of infinite loop ftw.