I replied to a similar post on another thread but I have the same issue with my black 64gb 3G iPad 2 which I ordered online. The leaking is the issue is a little bit less than yours but I was equally irate by the fact that I spent $830 on a device with a bleeding backlight. I made an appointment with an apple genius on Sunday and, after the issue was reluctantly acknowledged, I was advised to do an exchange since I am still within the 14 day return policy. Since the store, and all surrounding stores, seem to be sold out of my particular model, I was told to call daily to check up on it. So far no luck but luckily mine is also in perfect working order.
This post by domitron did strike a chord with me though:
"Light leaks and stuck/dead pixels are old problems associated with LCDs. I heard about them 6 years ago, and I am sure they are as old as LCDs. Stuck/dead pixels are far less common today than they were 5 years ago, so I assume the public outcry was so great that companies actually did something to reduce the problem (cleaner labs probably). The fact that dead/stuck pixels became commonly mentioned in warranties and what constituted a "broken" display demonstrates how much in the spotlight that particular problem as become.
Light leaks are a little more elusive because under 98% of display conditions they are not apparent. That's probably why they public outcry is less and they still show their ugly head to wildly varying degrees. The two iPad 2s I have played with in conditions that would enable me to confirm light leaks, both showed them. I also see that online either the people without the problem are very quiet or everyone has the problem who cares to look. At this point I would not hold your breath that a replacement unit would not have the same issue, and by returning your iPad you do risk getting one with a worse light leak and/or stuck/dead pixels.
Having said that, the only way Apple will care to fix a problem this slight is if they get enough returns to make it worth their time. I am betting that this problem will get fixed because Apple users are a pretty picky lot, but it'll be several months down the road. Right now Apple is far more concerned at filling the inventory pipe than anything of this nature."
Check out the other thread that discusses this issue, you may find more helpful info:
http://discussions.apple.com/message.jspa?messageID=13294718#13294718