Holy cow its been a long time since I posted here! I wrote an exporter addon people working with Unity might be interested in. Its meant to be ultra fast for simple static mesh assets. Your model comes into unity as a single mesh (with submaterials if needed) and 0, 0, 0 on all transforms (including rotation). It uses Empties to represent props, so you can export multiple assets from a single blender scene. I find this useful for sets of related props. It also supports Dupligroups (if any one uses those, I certainly do). I wrote it for my own production, but I figured someone else might find it useful.
I was too lazy to put it on the wiki. I hope a zip attachment is sufficient.
EDIT - I've stopped supporting this script, and removed the video showing how to use it. I'm leaving the file here if you want it, but use it at your own risk.