This article is from the Paris, France FAQ, by Thierry E. Toniutti and Delphine Kensit nemo_n@yahoo.com.
In addition to the transport passes, you can purchase the one, three
and five day Carte Intermusée from the ticket agents at all metro
stations. The Carte Intermusée pass allows you unlimited entries into
museums and monuments for the duration of its validity. The pass can
be purchased on any day as it is validated at the first museum or
monument you visit. It also comes with a complete list of
participating sites, the major musuems are all included.
The key benefit of the card is that you can enter museums through
special entrances, thus skipping the sometimes hour long lines at
museums such as the Louvre or Orsay. The cost of the pass is 80FRF
(one day), 160FRF (3 day), and 240FRF (5 day).
 
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