I've put together 14 high-quality original podsafe instrumental tunes from my Penmachine Podcast into a CD album you can buy. It also includes a bonus data DVD with a bunch of cool stuff that isn't on this website. Find out more...
I had meant to include a few more sites in Wednesday night's long list (below), but they slipped my mind:
photo.net is MIT professor Philip Greenspun's technology demonstration-philosophical statement-photography community site. It's also probably the best photography resource on the Web.
EdView, from Apple Computer, is great way to find informational Web sites (it's how I found World Wide Words, for instance).
Useless Knowledge - because who doesn't need some useless knowledge now and then?