
Stockholm City Bikes card - local version of the Paris Velib or London Boris.
Bonnierskonsthall - Contemporary art gallery - this card came free with the Moderna Museet card.
SL Card - like an oyster, but £69 for a 30 day season ticket
Friends of the Moderna Museet card. Free entry to the Modern Art Museum, National Museum (like the National Gallery and V&A combined), Architecture Museum and a couple of contemporary art galleries. Also money off in their shop and their very nice restaurant.
Library card - the city libary is one of the classics of Swedish architecture and also has lots of good books in English. This is probably the best of all our cards.