Detexify

Not that I'm a big LaTex user, but I thought this was a pretty cool tool. Basically, you just draw the symbol you're looking for, and Detexify finds the LaTex code for it. See the example I did below.


Oh, and Detextify relies on HTML5 to do its dirty work, so try to stick with Opera 9.6 / Firefox 3.5 / Safari 4 or better.