Macbook C2D 2GHz ca. december '06. Upgraded to 2GB RAM, 160GB HDD. Used mostly for Firefox, Virtualbox (OpenBSD and Ubuntu), iTunes. I only power it off when it locks up. That happens anywhere from every few days to every three weeks. Most lock-ups occur when I'm trying to tether via BlueTooth. Other than that, I just close it, wait for the LED on front to indicate that it's done storing RAM to the hard drive (it does that just in case the battery fails) and then I go.

Current uptime: 9 days, 8:23. About par for the course, I suppose.