DruTeX is a powerful LaTeX module for Drupal. It can be used to display mathematics written in LaTeX as images inline with other text, or separately as a downloadable pdf.
Features include:
rendering of maths or arbitrary LaTeX via latex + ImageMagic / dvipng
support of classical LaTeX-math environments like $x^2$, \[ x^2 \]
some plain latex2html and html2latex facilities (no external program needed)
pdf generation of nodes (with LaTeX)
highly-configurable input formats
security-enhanced modes (to allow even anonymous users to write latex)
Drupal / LaTeX UTF-8 (utf8) support
Able to remotely render LaTeX on a foreign server if your primary server doesn't support LaTeX