Going back to the legal aspects: i wouldn't worry about the NSA too much. If they want access, they'll get it. Probably already have, given the age of the project.
And providing that you aren't tagged as a "terrorist" by the US gov, it shouldn't be a problem for the average user or Maidsafe itself

I'd be more worried about Sony, tbh. Every dropbox system ever created has been used by the warez scene (remember the Yahoo Briefcase, godabuzz fans?) and an encrypted, decentralised, anonymous storage system certainly offers possiblities for the illegal sharing of copyright content.
If Sony (or any other big music/software/movie company) felt that MS was stepping on their toes in any way, the central core of the MS project will be an easy legal target, and Sony has resources that make the $12 million (?) from the IPO look like coffee money.
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The same problem also arises with law enforcement /police agencies: individual users may well be able to remain relatively anonymous, but the public head of the MS project is always going to be an easy target.

Any MS guys with ideas about this ?