No its not normal. Take it to an Apple Store and let them know it has done it since you got it. If it is a hinge they will try and charge you for it. Make sure to get it looked at.
Also, I have this little crack(?) or something on the side of the laptop. Does this warrant a replacement? I've barely touched my Macbook...only downloaded Firefox and Adium. I haven't even put up my own wallpaper yet!
get it changed. you can do it over the phone via mail, but it will mean being without your mac longer. Going to apple store will speed things up. your call on how bad you need it
Yeah you should be good. My MacBook is about a year old now. It does not line up flush between the lid and base and the lid wiggles a little. Nothing has happened and I love it. Very minor to me, but if I were in your situation I would complain to get a new one. If I could go back I think I might.