Here's a couple of my favorite midi files for you to download:

A piece from the film "The Piano":
Piano.mid
From REM's new album "Up":
Daysleeper.mid
Chopin's Nocturne in C# major:
Chopin.mid
Just to put us in the mood for the new film:
Bond.mid
Eric Clapton with 'Layla' Unplugged.
Layla.mid
Some Billy Joel
Pianoman.mid
Rachmaninof's Piano Concerto No: 3
1st Movement
The Beatles: 'I've just seen a face'
Beatles.mid
Download the whole 'Abbey Road' album, in midi format, as a zip file with this link:
Abbey Road

I'll add a few more midi files over the next few weeks. Don't forget to check out the links section for links to midi sites where you can find your own midi files.