Sealand is also the location for a data haven (www.havenco.com). Apparently it is set up so that only the employees of HavenCo and the ruling family of Sealand can land on the island where HavenCo are doing their hosting. This is almost too spooky when you consider Neal Stephenson's Cryptonomicon. This book talks about the setting up of a data haven in a mythical Sultanate in South East Asia. This is similar in that both places are ruled by a family that governs absolutely and can hence allow absolute freedom of information to smooth the way for the ultimate data haven.

More spookily though, Cryptonomicon also talks about a mythical WWII naval facility (in this case ruled by an ancient celtic(ish) family) called Qwghlm, on a windswept island near the British Isles.

Weird coincidence or what? I also read somewhere that one of the founders of HavenCo was named Avi but it was just a coincidence. Likely story.