G'day Matt,
There isn't much in there yet but InfusionAlliance has a Joomla hack that upgrades the user component so that it will post the contact to Infusionsoft through the API.
It only sends the Name, Email, Username, and Password currently and it's easy to put up.
You need to be able to FTP a file to your site and you need to open and edit a text file.
The edit only requires that you change the Infusionsoft account name and enter in your api key.
http://infusionalliance.com/index.php?option=com_content&view=article&id=124You'll need to register, then go to tools/joomla stuff