The vintage pattern archive at the University of Rhode Island granted free access to all comers for one week; ending tomorrow unfortunately! I haven't even scratched the surface. Check it out here (you need to use Firefox, everyone says). They've got over 48,000 patterns, dating from 1868 to the present, and you can see details on each including year, cover and construction drawings. If you're super-talented you could probably work out the pattern from the drawings, but for the rest of us it's an amazing reference guide and wish-list producer. Also, loads of fun! I've found lots of patterns I want, but also there's lots of stuff that's just fun to look at. Check out this crazy envelope art from 1966 for aprons:
And this "Yeah Yeah Yeah Jacket" from 1965, with skirt or pants. Hmmm...what could this be referencing?
I could spend days just browsing and writing down pattern numbers. Go check it out while you still can!