Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
picture link doesn't work... but go to the apple menu (upper left hand corner) system preferences -> dock and play around with it. You can choose to position your dock left right or bottom, change the size and whether or not it's always there or only when you drag your arrow to it (hidden/not hidden)
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.