So far (as a person who has been buying a LOT of 6'ers to up his bottle supply) I have found that the EASIEST bottles to strip, clean, and put back into use are hands-down New Belgium and Sam Adams.
Both brands' labels will come right off after no more than 5 minutes soaking in HOT hot water. Then, a simple scrub-scrub across the glue with a standard sponge, and it's go time. New Belgium wins the contest, their labels come off in one solid piece, after only running hot water over it, no soak! (Except for the 2 Below. I dont know why but they use different glue?)
Honorable mention goes to Guinness 11.2oz (with the widget). No glue - just slice the plastic label with a razor, grab the widget with needle nose (or two veggie peelers used as pincers!) and away you go! No sponge required!
AVOID Spanish Peaks from Montana. Their beer is tasty, but their glue is indestructable!!!!! It takes about 10 minutes PER bottle to scrub. I've actually thought about calling the brewery and tipping them off, because their glue is REALLY really harsh.
And by the way, CURSES to all you Wisconsinites, why won't you distribute Point this far south? It's so good! I am jealous!