I am having trouble making any positive changes to my mix, I still feel its lacking but I do know what else to do from here 
http://dl.dropbox.com/u/7979368/Song%203..mp3

http://dl.dropbox.com/u/7979368/Song%203..mp3
Everything sounds a bit too high for me, EQ wise, and things seem to lack meat. Could just be me though. Invest in superior drummer, or addictive drums. I know there are good torrents for it, but you didn't hear that from me.
bass guitar?