For my 50th mix, I decided to talk about myself in third person and to compile 50 songs by picking a favorite from each of my 49 mixes, and adding my latest downloaded track. I've ordered them linearly, starting from my first mix. It turned out incredibly eclectic (and thus a little bipolar--the first two songs are the best example of this).
EDIT: Since 8tracks went in and deleted songs, this is now down to 37 (and some playlists it's based on are gone all together). Enjoy anyhow!
So, if you have no idea what the hell kind of mood you are in, this is the mix for you.