Here are some links to very useful websites.
www.pianopedia.com
This website lists works by any composer you can think of, including information about each piece (average duration, date of composition, etc). Sometimes this site is painfully slow, but be patient because it is worth it.
List of Piano Competitions
A good place to find some competitions to enter.
Public domain scores and more
The Sibley Music Library at Eastman has created this amazing source to print scores that have fallen into the public domain. They also have scanned several manuscripts (of Schubert, Brahms, Wieniawski, and others) which you can freely view here.
Listen to a variety of great piano music
My friend, Jeremiah Jones, makes very good quality recordings and puts them on the web for our listening enjoyment.