In case anyone is interested, there is a free tool from Autodesk called the Softimage Mod Tool (used to be known as the XSI Mod Tool).
The full version you have to buy or download the student version. However the free version has just about everything you need for modeling. It's a pretty cool program and can be used for exporting models to Unreal SDK, CryEngine SDK and Valve's Source Engine (think Team Fortress 2, Left For Dead, Half-Life 2, etc).
Here is a link to Autodesk for the latest version (7.5 I think):
Softimage Mod Tools 7.5
or you can download the earlier version (6.0) which works better with Valve's SDK:
XSI Mod Tool 6.0
Not Uru specific, but it is a extra modeling tool at your disposal (can't ever have enough tools!!! )