Nook vs. Kindle

So lately I've been looking at Ebook readers because the prospect of having all your books on one device seems pretty cool especially since I just moved to Hawaii and don't want to accumulate a bunch of clutter. I then started to look into the Amazon's 'Kindle2' and the new Barnes and Noble 'Nook'. Both look pretty awesome. Any Nook or Kindle2 users out there? Does anyone have any preference?