Web
Kirupa — Tutorials on all kinds of web-oriented things.
GoTo and Learn — Flash Tutorials
Obscure Tags — HTML tags that should never have existed in the first place.
Music
RIAA Radar ‑Determine if an album belongs to an RIAA member. Check out their charts.
Arty
Prickie — Buttons.
Readymech — Print, cut and make cool little critters.
Clothes
Veer Gear
TOMS Shoes — For every pair sold, another one is donated to a kid in need.
Gaming
Rappelz — Free RPG
Politics
OpenCongress — Keep track of Hill-business and Congress-critters.