01/30/10 PC
12/18/09 PC How they do it in mathoverflow.net
10/16/09 PC How they do it in Wordpress
10/16/09 PC - Creating insertable LaTeX code: Type the LaTeX code into www.codecogs.com/components/equationeditor/equationeditor.php. This produces a *.png which you can upload. (Thanks to Henry Wilton and A. J. Tolland at the Secret Blogging Seminar for this tip.)