Disklavier

Here is another site with about 40 somewhat rare piano rolls-        
http://mmd.foxtail.com/Sounds/JBRoth/index.html

Also, don't miss- 
http://homepages.tesco.net/~stridepiano/midifiles.htm#_MIDI_FILE_SECTI
ON

The best jazz site is http://home.wanadoo.nl/dougmckenzie/. 

You can also use Google web search to find "piano midi" with many 
results.

Enjoy.