My Parisian partner Nicolas suggested that this pass might be of interest to some of you:
http://www.parismuseumpass.com/en/home.php
Apparently it allows one to visit any of the national museums and comes in 2, 4, and 6 day packages. It is a much better price than the other passes that we looked at this winter so it is an option if you want to spend short periods of time in multiple museums.
