This looks like a good BL, congrats. I'll implement it on my dsPIC30 when I have a chance.
I'm thinking about bootloading wirelesly with a couple of xbee series 1 with plain serial (no API). I don't see any major complications with this, do you? hehe it would be nice to now if there's a reason with it can't work from the begining.
Chances are that when you get all the stuff you've ever wanned from SF you won't know where to start...