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www.piano.ru - Russian website with extensive archive of piano music
Pianophilia.com - Piano sheet music sharing forum plus interesting discussion
Have a request? Post on this forum and you're likely to find what you're looking for.
Gamingforce.com - Another sheet music sharing forum but with little or no interesting discussion
Basically a gargantuan swap shop. You need to open an account to access the 'Classical Sheet Music' thread in the link. The site was originally started for video gaming enthusiastists, then expanded to include those interested in video game music (!?), then the classical sharing crowd joined because the administrators tolerate sharing of copyrighted works (sheet music and recordings) and they have large storage and download bandwidth capacity. Check out the index of all the sheet music available from the site.
THE source for 8 and 4 hand piano music. The proprietor, who I know personally, has many scores not listed on the website. Send him e-mail if you're looking for a hard to find gem. Substantial offering of free 2 and 4 hand piano music including symphonic transcriptions plus Godowsky's transcriptions of Strauss, Bohm, and Chopin (Studies for the Left Hand on Etudes of Chopin).
CD Sheet music - selling CDs full of sheet music
Yes, you have to pay, but it is pretty cheap. You can find most of their collection on 'gamingforce' (see link above) but if you want to own a legal copy this is the place to go.
Music of Charles-Valentin Alkan
A number of scores by an eccentric French composer can be printed out however most are view only
Extensive collection of music.
Growing collection of free music in the spirit of Project Gutenberg.
David Siu's Public Domain Sheet Music
David Siu has contributed a number of work to The Sheet Music Archive but also has his own website with some rare treasures: the complete Beethoven string quartets transcribed for solo piano plus MacDowells piano concerto no. 2 in d minor.