I often write about pieces of software that I enjoy. For Oo.org plugins, OOoLaTeX is, of course, one of those.
For those not in the know, OOoLaTeX is a plugin built for Impress that allows the user to input LaTeX syntax and (through the TeXLive compiler, I presume) generate images that will go in the presentation. The result is prettier than the formula editor and is easier to create (if you’re a LaTeX user).
The Sf.net project page link is found at http://ooolatex.sourceforge.net/.
Feel free to leave other, great, TeX-related Openoffice.org plugins in the comments!