One of the CPU fans in the system sounds like it's dying. Very distracting, and it means I can't leave the PC on all day for fear of it dying.
All I needed right now. Maybe it's a sign that I should have a break.
I see that the PC has been up just under 36 days. I think I rebooted it once since I installed Mandrake 9.1. That's not bad! Still, tonight I will have to let it sleep. If I sleep, that is.