Big.al - couple of thoughts (nothing too exciting).
Don't forget that your transponder is interrogated by numerous ATC facilities at the same time - but if you have a problem (and a total engine failure IS a problem) let them all know with that 7700.
If you come back to a Florida field, the FAA would prefer you to use the term "Non Towered" instead of "uncontrolled" (they tell me they are trying to stop the media doing stories about pilots flying "out of control" when they have a quiet news day).
Re: Aussie Andy's comment - I think I would still have used the term Mayday to attract everybodies attention at the local field - not a pan call (as was said later [redsnail]), it's far easier to downgrade the situation than it is to increase the tension. Especially in the USA - you may find students and pilots who do not understand the term "Pan", but they understand Mayday - and will react a bit better for you).
I'm interested in FWA's comment of "post 9/11" somebody WILL hear you - as goatgruff said, many people monitor 121.5 (I certainly do when I have two radios) and I helped a C172 between Orlando and Tampa two years ago.....which was being ignored by both Tampa and Orlando when transmitting on 121.5 to ask for assistance.
And depending on the interpretation of Englishal's comment - if I were in a remote area and not talking to any particular airfield - I would ALREADY be on 121.5