Scheduling Kiddos

As September is looming and my first born is getting older {2 1/2 years old already! Oy!}, everyone seems to be registering their kidlets in various activities. 

EZ is OBSESSED with playing in his backyard. He loves to play hockey, soccer, baseball, basketball -- anything that has a ball of some sort.

So far, I have my son registered in a Sportball program on Saturdays for 45 mins. I also plan to register him for swimming, skating and indoor soccer.  

But as I calculate the time spent on these activities, let alone the cost, it begs the question - how much is too much? 

I have to say that my son has a natural talent for sports that I want to encourage and develop, and he's a smart kid {I'm his mummy so I can say such things :) but he will also tell you he's smart because he has "big brains". I kid you not, ask him!}.  

So my not-so-melodramatic dilemma is do I let him try activities what he wants to try? Do I let him choose just one sport?

I'm a newbie at this, so I'm willing to take any good advice anyone has got to offer!