You may have picked up from the SL Viewer news that a change is coming to the Lab’s mesh uploader. There are, I think, some nice changes coming.
As it is now, when uploading mesh we often get an error and the error message is basically useless, no help. The Lindens are working to improve that. They hope to give us a better idea of what went wrong.
Also, we are currently limited to 8 faces per mesh. That means any single mesh object can only have 8 materials. That too is going to change. The Lindens are saying if there will be a new limit just that we can have more than 8.
There is also something changing about how the various LoD models and physics models will associate with our item based on file naming. I don’t get what they are doing here as I have yet to play with the RC/Project viewer that is out.