Vizor, and iTerm seems slow (last I checked, which was a while ago).

I just use Visor with the terminal (not iTerm) and it works fine for me.

In poking around for this Visor program, I stumbled across TotalFinder made by the same folks, and holy crap is it awesome. Chrome style tabs for my finder? Hotkey for sliding it in and out of focus? Who hasn't struggled to rearrange two or three Finder windows for some d&d? Yes please!

http://totalfinder.binaryage.com/