Piano Street "gives you access to over 30.000 pages of classical piano sheet music in high quality pdf format" and has both free and paid (inexpensive) memberships: http://www.pianostreet.com/
Here are some free templates for printing your own blank music pages -- they need a little tweaking sometimes (re-orienting the page layout), but they work just fine. And there's a basic free notation program at the bottom of the page, too: http://www.sheetmusiceditor.com/
And finally -- if you want to scan and share your own sheet music for others, here's the place to post your willingness as well as your requests. Some people mail each other postcards from around the world. Here is the place where we can mail music!
Members: 26 Posts: 2 Created: Mar 21, 2010 Type: Public RSS
