Josh Clark from the Stuff You Should Know Podcast, has put together two amazing galleries of old Halloween costumes. Really old, homemade costumes, and Seventies and Eighties costumes.
Retrostatic is a treasure trove of 80's (and 90's) TV commercials--from PSAs of singing pills to the Post cereal Create-A-Villain contest (and so much more). Also, cartoons, with descriptions and opening sequences of everything from Alf Tales to Thundercats.
A taste of Nostalgia... while it's not really an informative MeFi posted link, the list of commercials brings back memories. It's too bad there aren't any clips. Are any of these familiar to you?