Just buying some old Canon FD mount stuff off of eBay lately. You aren't kidding! That vintage glass really has some beautiful character, it's worth shooting all manual to me.
Agree! My favorite lens, not that it is used as an everyday walk around lens, is 300 f 4.5 manual focus Nikkor. Marvelous mechanical precision, incredible picture quality and works perfectly fine as a 900 mm equivalent with a 2x TC on a DX body.
Vintage glass is great, if you get it good condition.