Well...
They have the same sensor, the 60D is very much a poor man's 7D.
So it all depends on your budget and what you want to photograph.
That's a bit unfair IMVHO. To me they're just different cameras aimed at slightly different markets.
The 7D is a lot more money for exactly the same sensor, but better build quality and vastly improved AF; so I'm going to stand by my comment.