An unsolicited endorsement: I switched from TextMate to vim/tmux in February, and shortcutfoo.com cut my vim curve down by many weeks. Later I also started using it for git, even though I've been on git for years, and already have several new git tricks I didn't know before. I've been recommending it ever since -- great service guys!

It's like a tools kata for my fingers. I run a few reps most mornings just to get warmed up.