Some of these maybe a little dated, since this was posted in 2008. However as far as I can tell they look like they are still accurate. (I really don’t know much about some of them.)
The cheat sheets you can down load are for Google, Windows, Mac OS, Gmail, Firefox for Mac and one for Windows, Google Reader,
Linux, Thunderbird and Internet Explore. If your use these, you should be much more productive.
See them all here: http://www.makeuseof.com/tag/7-essential-cheat-sheets/
To get the sheets, you do have to subscribe. But it is free.
