I've got a macbook pro 13" mid 2009 and I upgraded to OSX Lion immediately when it came out. Never had any problem with it. Also I upgraded to 8 Gb a few weeks ago (because I use a virtual machine (win 7) + Adobe applications at the same time) and that seemed to work just fine.
Since a week or so, the OS seems to freez all the time. Just typing this message it happened more than 6 times. By Freeze I mean that the system doesn't seem to react for 10 seconds or more, and sometimes it shows the spinning wheel (waiting sign).
I did a clean install of Lion yesterday, but this didn't solve the problem. Any ideas?