Theres also another free tool on the autodesk site that converts from to DAE/FBX to OBJ. 

You still have to clean up the mesh, usually triangulate and map, but that seems to be the way wether it's wings, blender or even using sketchup pros own OBJ convertor.

What I've also noticed is some models come out better than other. The trick appears to be find a model thats been well made to start with and imported into sketchup.

Pinky - you left the lens cap of your mind on again.