Breakaway? Simple.. make the goalie move and then shoot the puck where he isn't. A good goalie won't back in far enough to give you a shot he can't stop from the high slot, but faking a shot there can make him freeze.. and then you're good to go. Personally, I'm 6'3", so I can have a bit of fun and fake one way and go the other and move the puck about 8 feet with relative ease.
Either way, when I go in on a break, I usually like to have a variety of things I'll do as I come on the goalie and come in patiently. If I have a lot of time, I'll kick my leg in the air ala Ovechkin, if not, it's just as easy to flick my wrists in front of the puck. If that gets the goalie to really bite, I'll shoot, if not, come in a bit closer, start going one way, occasionally do a second wrist fake, depending on just how much time I have, and then pull back to the other side. Personally I love to come off the RW as a left handed shot, just slightly from the side, fake the shot, start going to my forehand, go to my backhand, and then pull back to my forehand.. works more often than not, as long as I do it quickly enough. Worst comes to worst on the move, there's a lot of times where you can just shoot the puck, which is the beauty of it!