Handy command reference cheatsheet for Redis (code.google.com/p/redis/).
Please note that this is now quite old and hasn't been updated in a long time. I'm currently not heavily-using Redis and haven't had the opportunity to bring it up to date with the latest Redis. Feel free to do so if you're interested, of course!
If you'd like to make changes, I've included the OmniGraffle file, although you may run into issues if you don't have the fonts. Feel free to make changes and send a pull request, or open an issue.