Abender, this is a good one, too. Lots of options.
Texify - Online LaTeX equation writer, generates math formulas from LaTeX expressions.
Fellas,
I am not sure if this site has been mentioned anywhere, but I have been using Roger's Online Equation Editor in lieu of gnux (since gnux is down). I think it serves its purpose well, at least until the LaTex on this site gets fixed up. Follow the link if you are interested.
-Andy
Roger's Online Equation Editor
Abender, this is a good one, too. Lots of options.
Texify - Online LaTeX equation writer, generates math formulas from LaTeX expressions.