STL validation (design rule checks)

I've seen a few comments around the reprap forum regarding some sort of tool to do design rule checks before printing an object.  It sounds like a very sensible development and I stumbled across this good example earlier today:

http://eu.redeyeondemand.com/viewlets/DiscoverSTL/DiscoverTest_viewlet_swf.html

It would be great to incorporate this into Skeinforge, perhaps initially as log data and then later with some sort of visualisation...  another one to add to the (rapidly growing) list