We first talked about the Universal Wiki Converter (UWC) in a July blog post:
The Universal Wiki Converter (UWC) is both a GUI tool to assist customers with converting their wikis and a well documented,
extensible framework for creating new wiki-to-Confluence converters. We typically receives at least one inquiry a week about
converting another wiki to Confluence. Looking at the common activities associated with these conversions we've created a process
and framework to support those activities.
We've updated the UWC to include a fourth, very popular conversion tool: MediaWiki. Jonathan talks more about the updated UWC on the Developer's Blog.
Go check it out.