Does anyone have a good source of advice on upgrading Macs -- or finding cheap ones? I don't want to switch to a PC. (And I can't say much about what I have 'cause I can't get to that info while I'm here: it's a Power Mac 6100/66 -- it has a habit of running out of memory, crashing when opening attachments and -- lately -- being unable to shutdown properly. I don't think it has a sound card).

Thanks. By the way I know next to nothing about computers, so if you have advice, you have to talk babytalk and walk me through things.