If you want to avoid getting your money caught in the whole FDIC whirlwind. You can opt out (for the most part) by opening a Treasury Direct account.
http://www.treasurydirect.gov/indiv/indiv.htm

It's like opening a savings account with the US treasury. It seems to be the safest thing to do, this side of stuffing money in your mattress.

This is assuming you trust the Treasury..