I actually read the full thread on the light leak issue here last night, partly out of personal interest and partly as I am kind of in the industry for these types of devices (not Apple emp). Anyway.. My original iPad 2 (white, bought from an Asian guy.. I'm being serious and not meaning any disrespect.. just saw that thread

) had significant leak. When I say significant, there were at least 8 blotches of light, a few of them an inch or bigger. I took it to the Apple Store and the guy was awesome and said if it was him, he would exchange it. I did, for all that was available, a black version (all were 64GB at&t).
I took the second one home and while not as bad, there was definitely light leak visible from normal usage (Apple did make this to watch movies on right?). I went back to the Apple Store (we have two very close to me) and spoke to a guy that all but said they know about it, are working on it and it is a warranty issue. I could keep mine and exchange it in months or I could keep exchanging .. or return.. my choice.
I eventually decided to return it for now as I just can't bring myself to be OK with what is, IMO, a flaw. Folks can argue all day and night here that it's normal/acceptable/whatever but how Apple is handling this tells me it isn't. I have spoken to at least four Apple employees and all were very understanding and never mentioned "in spec".
Where I am now is considering just going to get another one and dealing with it or possibly getting an iPad 1 and looking forward to retina-display on 3. Dunno. I do know the iPad rocks (1 or 2) when it doesn't have hardware flaws and I already miss mine.