Well, it's not really "mine" but I've ported the mod_anything to the Joomla 1.5 code. The code was originally developed by Justin Cook but for the 1.0 series (see this link).

The module basically let's you add anything that you want and publish it to a module position in your site. Very handy when you want to add some code and can't let Joomla touch it.

You can download the module here

All credit goes to Justin Cook for the module development.