Like someone else mentioned, they are essentially cheat sheets. Very useful if you already know some other programming language. I especially like pages that

Like someone else mentioned, they are essentially cheat sheets. Very useful if you already know some other programming language. I especially like pages that map the features of one programming language to another (that I already know). The recent AlloyUI post was an example comparing it to jQuery and YUI: http://alloyui.com/rosetta-stone/ http://alloyui.com/rosetta-stone/ And also see Rosetta Code http://rosettacode.org/wiki/Rosetta_Code http://rosettacode.org/wiki/Rosetta_Code