There are some interesting bits of information coming out. I have some here from the Content and Mesh UG.
This is Google’s famous tool for building 3D models. It has a low learning curve and quite a bit of ability. Using it came up in the Content and Mesh Meeting Monday.
It seems people are building things using Sketchup and bringing them into Second Life. All works well until they UNLINK them. A 100 prim Land Impact can jump to 500 prims. The reason is Sketchup makes a model as lots of small parts. When one unlinks the parts all the less than 1 prim costs that were being added together while linked, have nothing to add up with and thus round up to 1. The round up kills the prim savings.