So, cheapie upgrade ($300+ for CPU, motherboard, 512 MB RAM) and I have a brand new computer! :D I think the most surprising thing about this computer is that it's so quiet. Apparently the processor and motherboard support this "Cool N' Quiet" technology that automatically adjusts the fan speed based on the temperature of the processor, so if it's not very hot it'll be quieter. Amazingly, it actually works! I can barely tell that my computer is on. I think my TiVo is louder. ;)
I'm trying to figure out what to do with my old hardware. I suppose I could sell it on eBay, but that would require... effort of the kind that is not fun. Maybe I'll try craigslist.