How does this work? Where do you buy it from? It seems like cost of 3 days is more than buying 3 one day passes - is this true? If we plan to do the 24 or 72 hr Vaperetto passes, Secret Iteneraries and Guggenheim Museum among other things - is it worth it?

This info is copied from this site:
http://www.venicecard.it/rolling_eng.jsp

The Rolling VENICEcard is designed for young tourists, aged between 14 and 29. The membership card costs € 4 and entitles the member to incomparable discounts. Just an example: the 72-hour ticket good on all the Venice, Mestre and Lido water and road transportation lines can be purchased at 15,00 euro instead of 25,00 euro.

Moreover, Rolling VENICEcard holders benefit from the same discounts of VENICEcard Junior.

Rolling VENICEcard terms of use 2006:

Rolling VENICEcard can be purchased only in Venice Cardholders can benefit from reductions in associated restaurants and cafés showing the card before asking for the bill
Discounts are not eligible during sales
Cardholders can benefit from reductions in associated hotels, lodgings and hostels showing the card during the reservation
Cardholders must produce further means of identification, since the card is not provided with a photograph of the owner in case of discounted public transport ticket purchase, cardholders must write the Rolling VENICEcard number on the back of the ticket
Cardholders only are eligible for discounts.

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To purchase Rolling VENICEcard:
in every Tourist Information Office (IAT/APT)
Tel.: (+39)0415298711 (+39)0415225150
Fax: (+39)0415230399

in every ticket office VELA
Call Center: +39 041 24 24