$\sin(n \pi) = 0$Just paste a bit of code into your page's header to load it. You don't need to install any files.
Typesets LaTeX and MathML into nice, clear, readable notation.
\[ \operatorname{erf}(x) = \frac{2}{\sqrt{\pi}} \int_0^x e^{-t^2} dt. \]
I've written a very long post on my blog about getting maths on your blog.
Summary: you can get it working everywhere except blogs hosted by wordpress.com
I've written a bookmarklet which inserts MathJax into any page, even if you can't edit it directly.
For example, here's a tweet I tweeted earlier.
Wow! My life can be divided into pre-12/12/11 and post 12/12/11.
— Timothy Gowers.
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