I have created a new plugin called: WP Math Pub. Display mathematical expressions using dynamically generated images from special "[pmath size=xx]plain math text[/pmath]" tags embedded in a WordPress post.
It uses Pascal Brachet's phpmathpublisher library. It's an update to Matteo Bertini's WordPress plugin called PHP Math Publisher.
You can see how it works and get a copy here:
Best regards, Ron