I have just finished a lot of work on the new start program the replaces the old SL Starter. This new version fully supports Windows Vista and makes it much easier to use different grids, even with the same avatar name (you can have different passwords for each set of grids).
It has the biggest grids already typed in (links to join, the correct parameters to launch a viewer to that grid, etc), including how to launch the viewer into your own local OpenSim (assuming you have set it up using the defaults).
With Virtual World Starter, one software shortcut will load any of the virtual world viewers, starting with any of your avatars. On top of un-cluttering your desktop, it gives you the ability to have a variety of configurations of the viewers at your fingertips, and can launch multiple viewers at the same time.
For a simple two avatars, one main, one testing, on three grids, Second Life/SL beta/OpenSim grid, with two settings, Windlight on/off, with two viewers, main and RC, that requires twenty four different shortcuts, just for this simple set up. With Virtual World Starter all that is taken care of with one shortcut (well two, if you want to be exact, there is an option to run it in a mini version as well, that takes up a lot less of the screen, should you desire).
All the information about it is here: Virtual World Starter
