It's official. The open beta for mesh in Second Life starts on Wednesday, October 13th. There will be a special version of the client that supports mesh, and a separate grid to sign on to. Once there, you'll find that you have a goodly supply of Linden Dollars--they only exist on the beta test grid, and are there so you can experiment with mesh upload.
I am hoping for a veritable cornucopia of breasts built from mesh and, even better, enormous-breasted mesh avatars.