Does Robbie Rock?
There's a platform out there that has some attraction to corporations, but hardly known in the regular Virtual World Business, named Why Robbie Rocks.
Now it's pretty hard to define what exactly is a virtual world (see this discussion at Metaversed), but I think Why Robbie Rocks should be considered one, except... it doesn't really show. There's quite a bit of preformatted avatar pimping, but that's about it.
A feature on the website is the Elle Girl shop / site which uses WRR. As for serious business, also Dutch banker Rabobank (one of the few triple A rated banks in Europe) runs WRR and the latest is the Dutch One Campaign version.
The fun parts though is that there's web 2.0 integration. You can put your avatar on the (Google) map, push it to MSN spaces, MSN Messenger or embed it on your website or as a gadget on the ruling Dutch social network site hyves.
I haven't been able to see the full potential of Why Robbie Rocks, so tell us, why should we sign up?