list of most popular homophones
http://grammar.ccc.commnet.edu/grammar/notorious/notorious_frames.htm
Scroll down the list at the upper right.
http://www.earlham.edu/~peters/writing/homofone.htm
And many others:
http://www.google.com/search?q=homophones&rls=com.microsoft:en-us:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7SUNA