Nice idea!
I'm a newb, but i'll offer you any of the 3 tracks I've got so far:
http://calaveralovesyou.bandcamp.com/

If you do for whatever reason pick one, i'd love to hear a list of things you did so that I can learn to mix/master better too. Almost like a pay-it-forward learning scheme.

Also for the record, cTrix has 52 weekly beats that he's just completed, some of which were rushed, unmixed, unmastered, etc etc. He told me he was considering releasing them after he's polished them all up, so maybe you could offer to help him out with his workload? He could probably give you pointers too.

http://weeklybeats.com/ctrix

I've been making music with my computer for about 3 years now, and I've got a basic understanding of mixing and mastering, but it's probably time for me to get a little more serious with it.

What I'm asking from you guys is to send me stems to mix/master, or mixed down songs for me to master. they can be brand new songs you want mixed by someone else, or old songs you are sending over just to help a bro out, it doesn't really matter to me.

I learn best from hands on work, and doing it with my own songs is kind of obnoxious, also most people recommend having someone else mix/master anyway, so this sounds like a good way to learn for me. I can't promise they'll be super good right away, but if I get super good at it in time, I will mix/master for anyone who helps me out now for free anytime they need it.

Post links to download in this thread, or pm me if you are more comfortable with that. thank you to anyone who responds.