Good to know, as I was tempted to move them back or reflash and now I wont bother. A simple reboot fixed it anyway and to be fair, I had about 13 days uptime with extensive use (IM connected all day, every day) which is far better than I ever had on Windows Mobile with light use (because it was generally far too slow to use anything like how I do the N900).

Its quite curious actually as I have similar experiences with desktop Linux slowing down over time, not the applications or daemons, just graphical stuff. Makes me wonder if this is all related to Xorg somehow.