Detexify is a neat little tool that let's you draw a symbol and then finds the corresponding LaTeX notation. The explanation is an interesting read as well.
posted by swordfishtrombones on Jul 21, 2009 - 38 comments

Texify is a pretty convenient web-based way to typeset LaTeX equations (and get a linkable image).
posted by Wolfdog on Sep 3, 2007 - 10 comments