I have this web site I update once in a while: NameTheComposer.com. It is mostly a set of scanned excerpts of pages from my collection of piano music. Site visitors are invited to identify the composer and the piece of music. I have not found time or suitable interface to make it a real Q&A or quiz type of interface, so for now you are on your own as far as identifying the scores.
In addition to the scans I added this video a while back, and defy most anyone to guess the composer. Anyone, that is, who does not already know from having seen me post this elsewhere.
