This is the actual multi-day museum pass Frugal Scholar was referring to in her comment on my post on Musee D'Orsay this week.
I was simply suggesting you buy your tickets for the Musee D'Orsay on-line prior to the day you go, but she is right: the Museum Pass (which I have never used, fyi) does seem a great deal for the money: 4 days for 56euro? I think I'll buy one this summer when I am in Paris only for that short stay.
Researching the site further, I realize why I never bought one before: you can either have it shipped to you (for an additional cost, which lessens the economical appeal) ....or pick it up when arriving in Paris, on rue des Pyramids for free. Or buy it in the CDG airport, or FNAC outlets.
Okay, it's sounding better and easier.
Given that the pass includes entry to the Musee D'Orsay, the Musee national de l'Orangerie, the Musee Cluny (medieval art and culture), the Louvre, the Musee Rodin, and the Musees des arts decoratifs, when it costs me 16euro alone for the first two sites... and it will get me in without waiting on lines... and I'll have paid for all of my entries upfront and never have to worry/open my wallet again, this seems a worthwhile purchase.
It also means that I'll be bound and determined to get to at least 4-5 museums during my five-day stay, no matter what.