Howdy, i built somthing related to slurls, in 2009 i started to get involed in twitter alot, then i decided there should be a shortner just for slurls, i developed my own called tpurl.me, this lasted until later this year when i had to pull back most of my costs inside second life (i may rebuild it again if there interest is there), a friend of mine is also building her own shortner service too sl8.us with facebook intergration, inworld intergration and twitter intergration via the oauth scripts provided by babbage linden.
Just thought id shed some light on the stuff the commuity has been doing for social networks, it would be awesome to see an offical shortner service from the lab.