i think i have the exact same thing. except mine bows out a little on the right. I wonder if this is very common?
How long ago did you get yours?
Do you think you will bring it in?
I got my MacBook a few weeks ago. I will be taking mine in this weekend for a combination of things.
1. vibration
2. whine
3. bow
4. cover movement as described in this thread
5. (might not be a problem) I Just realized last night my MacBook is draining power in sleep mode on the windows side. Im going to test it out today in OS X.