It has, most importantly, an Ogre viewport where you can view your models in Ogre without leaving Max. The viewport control is totally dynamic and may be constantly updated, and the controls mimmic max's viewport controls. You cannot manipulate object in the viewport, though.
Of next importance (for me) is the Ogre materials manager. This allows you to put ogre materials onto max objects, while keeping the max materials on as a submaterial. This allows you to manipulate all the regular material maps, such as normalbump, specular, enivornment maps, and their Ogre properties in the MAX materials window.
It also has a scene manager and some other tools, including a tempermental but otherwise functional exporter to OSM Ogre scene files. When it is working, the exporter will export mesh object, the scene and their materials and animations to an Ogre file type.
The devs have included a number of different tutorials to ease you into the workflow. I highly recommend this plugin as *essential* for MAX users in this project.
Edited by fux0r666, 09 February 2006 - 09:04 PM.