http://twtex.nl/

For all those times you've wanted to tweet an equation!

Ok, so that doesn't happen very often, but now you can! Just enter an equation in LaTeX (x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}, for example), and you'll get an image and a Twitter-friendly URL to paste into your tweet.

Yes, the target audience is small, but feedback is welcome!