Good stuff, dude. Lots of cool little bits that I didn't know (flatten mapping and copy/paste UVs).
If you find pelt mapping to be a bit akward (as I do) it's sometimes easier just to use pelt mapping to get the seams and a best fit projection but never actually do the pelt pulling (if you need seams, that is) then go to the relax dialog (Tools > Relax Dialog on the Edit UVWs window) and hammer that a few times. Seems to give much smoother results without as much fuss.
Here's a non-sendspace mirror for the file, too. 