ExpressionEngine 2 Quick Reference Chart
Over the weekend an updated cheatsheet for EE 2 was posted: ExpressionEngine 2.0 Quick Reference Chart.

It contains the most commonly used tags and their parameters and variables. It even has a handy list of date formatting codes (which for those of us who are forgetful is extremely useful).
Download the free PDF, print it out and tape it to your desk.
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ejaeDesign — 14:01 on 07.20.2010
Thanks a bunch Ryan. This is great to have the list as a chart. In fact, sending out a much obliged Tweet in 3.. 2..