Rattlesnakes, what can I do about these pests?

I found a 3 foot rattlesnake in my backyard. It really gave me the shivers. What can I do about these kind of pests?

That depends on where you live mainly. If snakes like that are a common problem then eliminate the areas that would give them reason to be there.

I found this in an article

Keep the clutter down. No piles of wood or leaves, nothing they can nest in or hide under. Keep the grass mowed so they don't get comfortable hanging out in it. Also, take care of any rodent or insect problems quickly. If the snakes are migrating to your yard, they've probably got a good reason. A buffet line starring roaches and mice is one of the best.

Take a stroll around your house and inspect the foundation and the ventilation holes in the garage. If you see any holes bigger than about a quarter then you've hung up an "apartment for rent" sign for the snakes. And for heaven's sake, don't leave doors standing open!