FYI the voting thread is now live:
http://lifehacker.com/5826280/five-best-ebook-readers
They opted to combine all Nooks into one category, I think partly because the nomination thread demonstrated that many people who own one Nook (whether 1st gen, 2nd gen or color) are not aware there are other Nooks out there, and so votes of "Nook" are uninterpretable. Even discounting the plain "Nook" votes, both the Color and current-gen Nook had more nominations individually than any other device except the Kindle.