I find the Nook Color quite heavy to hold for long periods - after playing about with it the weekend I got it, my wrists ached.
Which is why I've ordered
this cover from Amazon.
There's also
this one for portrait orientation if you prefer.
That way I can sit it on a table or lap desk and the weight doesn't matter.
I'll tell you how I like it after it arrives.
EDIT: Aw, shoot - I just realized you're talking about the Nook Classic and not the Nook Color. Never mind.