Simple SketchUp to Second Life Exporter [eightbar.co.uk]
[SketchUp's] long been discussed, in conjunction with Google Earth, as a potential virtual world, and rival to Second Life. ... Eventually I gave up my search for a basic SketchUp -> Second Life exporter and realised I was going to have to write one. ... Ok, so it’s not very good, and it doesn’t bring us any closer to the nirvana of complex models being automagically generated using the minimum number of prims, but it was so easy that I’m very surprised not to be able to find anyone else taking this approach already.