If you love complex math formulas, then WordPress.com has you covered now. They have added LaTeX support for WordPress.com blogs, allowing you to add some advanced math formulas to your blog.
From the WordPress.com blog:
Odd as it may sound, I miss all the equations from my days in grad school, so I decided that what WordPress.com needed most was a hot, niche feature that maybe 17 people would use regularly: LaTeX.
For those that don’t know, LaTeX is a typesetting system particularly well suited for documents of a mathematical persuasion. It’s used almost exclusively by many technical, scientific and mathematical disciplines both in academia and industry. It also looks really good; I, among many, consider Donald E. Knuth a personal hero.
Check it out if you are interested.