I've got a 2008 MacBook Pro (Late 2008/Unibody, MB471LL/A, MacBookPro5,1, A1286) with 6GB of memory and a 160GB OCZ Vertex 2 SSD running 10.6.7 (1OJ869). Around a month ago I noticed the machine is constantly freezing all the time for a fraction of a second, it's really regular and barely noticeable in general use. It's more obvious when scrolling down a long page in Safari (5.0.5) but really noticeable when playing YouTube clips, there's constant pauses. The odd thing is that video played by VLC (1.1.9) is totally smooth. I'm thinking it might be a Flash (10.3 r181) thing as it seems Safari-bound.
I can provide any diag information if anyone would like to help me out (ps -a, top etc. just ask). Thanks in advance.