I find it interesting to see what people collect, catalog, and build a website to display their glorious collection. In that interest I have two sites I've been to and found interesting:
The first one comes from my dad and is dedicated to Penny Postcards. The post card was patented in 1861 by John P. Charlton of Philadelphia and for a while only the USPS could produce them. Wikipedia says the above, but then says that the first postcards in the US were made to advertise for the 1893 Columbian Exposition in Chicago. Soon, though, the cards were able to be produced by anyone and this gave rise to the versions that we see today, although then the sold for only a penny-- thus, penny postcards. The site is arranged by state and has a pretty thorough collection. One of my favorites.
Our second site is Midwest 45s. Scott Harlow is a friend of mine at Grace and every Saturday morning he heads South to the old pawn shops on the South-side and digs around for Soul, Funk and Gospel 45s from Indiana, Michigan, Ohio and Illinois. After he finds them he digitizes them onto his computer, puts up their album art and lets your ears pulsate to the long forgotten beats. He has quite a collection going on but of all that I've listened to, I really dig this one.