Vim is nice, MacVim is nicer. It'd be perfect if it had the the project drawer from textmate on the side, instead of wierd-textmode treecontrols which i never quite master.
*C* (that's capital C), to switch the folder under the point to root
*r* to refresh
*m* to perform (or pick) a file system command
*cursor-keys* to move up and down
*?* for help