Also, I'm having problems with web browsers (Safari/Firefox) lagging. If I open a text heavy page, the content seems to display half a page then hang for a couple of seconds before completing the rest of the page (most noticeable on BB's like the forums in MacRumors). The problem is also noticeable when trying to playback embedded video clips. The clip can completely load before I try and play it back but still stutters every few seconds (as if it's downloading).
I don't know if the two items are linked or not (initially I thought the browser issue was more a QuickTime thing but not sure now with the pages only half loading.