That companion website on Kaneva is vital though, since I can manage all of my media assets, relationships, grouping, etc, without ever logging in. SL is supposedly going to have this, but they have a much slower dev cycle.

Google can implement and WELL. They lack avatars, but every other component and a massive 3D object repository already, yeah, game on.

I've seen this one for a while and have been scrambling to recreate all of my work in SL in formats that can import to any 'defacto standards'-based virtual world or game world that comes along.