The Google Reader Team just launched a new version – Congrats! For the first time (as far as I know), it was introduced using Google Video by Chris.
Like Gmail, Google Reader uses keyboard shortcuts to navigate efficiently. It also helps you to prevent carpal tunnel syndrome (link to the Google Doc’s site).
I love shortcuts, but have a hard time to memorize them, so I made a printable version of the document:
Google Reader Printable Cheat Sheet (1/2 page)
Google Reader Printable Cheat Sheet (really small)
I also made a printable Gmail Cheat sheet version a few years back. Evan recently did a html version.