I know this thread is fairly old now but....
Super injunctions were recently in the press so there should be a lot of info about them.
Essentially, an injunction concerning the prohibition of divulging certain information involves a balancing act between privacy (Art 8) and the right of freedom of expression (Art 10).
The court can then attach certain 'extras' onto an injunction - an order for anonymity for example (this is common in family cases.) The court can also order that the whole proceedings be conducted in private (pursuant to CPR rule 39.2) and no report is published. This is what makes a super injunction "super."
I would recommend a read through of the Mosely case: [2008] EWHC 1777 (QB)
as well as cases such as LNS v Persons Unknown (the John Terry case) and DFT v TFD.
There are some good articles out there too. One which gives a good commentary on the state of the law is written by David Eady, called "Injunctions and the protection of privacy" it was in the Civil Justice Quarterly.