Recently, I came across a question on StackOverflow where a guy asked how he could edit Standard Values for a certain template using Sitecore Rocks (here is the original question with my answer). Rocks has so many features, that it is not as trivial to keep them all in one's mind. So how do I challenge that?
The document I have found (and even printed out) could not be over exaggerated and lists most of the features grouped by the way you access them just in one two-sided A4 paper.
You may download it by this link.
One more point to mention: in case you have some decent experience with Sitecore already but never used Rocks, please do give it a try. For the first moment you will not find it as convenient and the more you got used to classical Sitecore web interface - the harder you may find it to start using Rocks. But please, don't give up with that, just give Rock a bit more time and as soon as you start getting used to it - you'll start wondering how did you manage to work without it previously and why didn't you try it earlier!