My ipad 2 also has the same issue. The black plastic part is slightly separated from the glass on the top left corner (near the headphone jack) and the metal edge is slightly separated from the black plastic on the lower left corner.
Is this issue really serious that I need to go get an exchange? Or is it just merely more of a cosmetic issue? I'm scared of swapping it and then getting a new ipad 2, only to find that it suffers from some of the many other more serious complaints that others have brought up. I just worry that dust or other small particles may get into my device and cause any kind of long term damage.