To let you know what is going on with jOpenSim:

I'm currently working on brand new modules (profile, search, money) for OpenSim to interact with jOpenSim. Lots of C# learning has to be done from my side for this, but the first tests look really cool. Please be a little patient with me as this is an absolute new field for me...

Also I'm looking into converting jOpenSim for Joomla V1.6+...