Last.fm, get out of my dock!

I recently formatted my Mac - before I did, my last.fm opened in the menu bar but I never once saw it in my dock... since redownloading it, it will only ever scrobble my songs if I launch the app (which opens with iTunes) but it sits in the dock as well as the menu bar. Can someone tell my how to just get it to open at login and only be in the menu bar?

right click on it and select "open at login" and select "remove form dock"

Uh... It'll still be in the dock when it's open...