Advantages / Disadvantages of 'freemium' concept

As advantages:

-free service brings many people on the website
-"clients" are not bounded
-may create "regulars buyers"

As disadvantages:

-frustation because people do not use the entire service
-difference between the service (value) and the price you paid to use it
-conversion rate: how many persons using free services pay for premiums one

easy group

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Long Tail (longue traine in frech)

Have a look on this article (it's in french sorry for my colleagues who don't master yet with french ). It give us the "rules" of this business model.

http://www.journaldunet.com/0703/070326-net-long-tail-definition-solution-outils-longue-traine.shtml