I'm going to keep this short and sweet. Juno was a cute movie. It'll make you feel good. It's like Napoleon Dynamite without all the awkwardness.
The acting is great. The dialogue is hilarious. It's as good as all the cool people are saying.
There is, actually, one aspect that's a little awkward, but you can see it for yourself.
Verdict: Movie theater it! (But if you're broke like me, wait for the DVD. There's no crazy special effects that would entice you to see it on the big screen.)