Don't bother seeing Babel. It's moderately interesting, but tediously slow. This review headline has it right:
Crash was much better, as are some of Alejandro González Iñárritu's other movies, like Amores Perros and 21 Grams.
Skip Babel. Rent Amores Perros instead. It's also a bit slow, but much more original and interesting.
While we're on the subject of long, slow movies, I also saw The Good Shepherd. It's worth it.