I'm circumcised, and I've seen a couple studies on this. Here's why I would have my son circumcised:
1. It apparently adds a full inch to penile length. And, hey, an inch can make a big difference.
2. Not having a foreskin can prevent yeast infections, and no one likes yeasty body parts.
3. I was circumcised within an hour of birth, and there was minimal bleeding and no crying whatsoever (according to my parents), however, my brother was cut 2 weeks after birth and he was screaming bloody murder (again, according to my parents). Circumcision right after birth is apparently less painful, since you're not fully aware of your surroundings, you know, since you've just been born.
If I weren't circumcised now, I would not want to be because I like to keep sharp items away from my junk, and I would think the operation would hurt like a *****.