Just as a heads up for all you chemists, you can now use the ce tag to generate chemistry LaTeX.

 

For example:

 

[ce]H2O[/ce]

Will generate [ce]H2O[/ce].

pretty sweet

[ce]H2SO4 + Al[/ce]

 

maybe you should add some stuff for the commonly used arrows as well.

[ce]NeAt[/ce]

If you want arrows you can have them!

 

[math]\ce{-> ->[\alpha] <- <=> <=>> <-> v ^}[/math]

 

and even

 

[math]\ce{Zn^2+ <=>[\ce{+ 2OH-}][\ce{+ 2H+}] {\underset{\text{amphoteres Hydroxid}}{\ce{Zn(OH)2 v}}} <=>[\ce{+ 2OH-}][\ce{+ 2H+}]{\underset{\text{Hydroxozikat}}{\cf{[Zn(OH)4]^2-}}}}[/math]

 

There's more in the mhchem documentation (mhchem provides the Chemistry [math]\LaTeX[/math] here)