I'm a CodeRush fan (being primarily VB.Net at work Resharper wasn't an option when I started) and am continually amazed by how many features are included. Each time I addict a new user they come up with something I don't currently use as their biggest time-saver, and would love to learn some new, useful features from the Stack Overflow community.
Any CodeRush users out there, please reply with your favorite CodeRush feature and the keyboard shortcut to access it if appropriate. Thanks!
I'll be first to be optimistic and assume this isn't spam ;)
Widen Selection (Ctrl+W) is fantastic; with your cursor on (say) a variable, Ctrl+W will "increase" the selection to the next member; another prod to the next member, or the whole line. Very handy.
Most people know how to drop markers (Alt+Home), and how to return to them (Esc). But not a lot know about the "Swap Marker" function, which drops a marker at your current location and then returns you to your previous marker - essentially a quick-swap between two locations.
Shift-Escape is also a bit handy - "Return to Marker and Paste". Try it out :)