Goalies

Glove placement
Stick placement
Butterfly notes
Puck behind the net/Wraparounds
Breakaways
Stacking the pads
Reacting
Playing the angles

I'll add some more tips on here later, but for now, the basics...

1) Keep your glove up! No matter what your stance is, keep your glove up! Keep it at chest level, out and away from your body, and out in front of you a little bit.

2) Keep your stick down, flush on the ice. (This is a roller hockey page, but I'm used to calling everything "ice", so excuse that.) Don't try to sweep the puck away before it gets there. Also, don't put your stick against your skates, because whenever the puck hits it, it will bounce back and give a big fat juicy rebound. When you do the butterfly, or anything else that you're down on, keep your stick down, with the paddle of the shaft down in your five hole.

3) When you do a butterfly, spread your pads out far, so you can cover as much of the goalmouth as possible. If the shot is low, keep your glove on top of your pad. If it's high, keep your glove up. Keep your stick in your smaller five-hole. If the shot is on your blocker side, try to throw your body in front of it, or at least put the blocker on it.

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Situations

Wraparounds - Put your skate up against the post, and have the side of your pad on the inside of the post. Put your other pad straight up against your post pad. If the puck is on the stick side, have your glove on your side, and poke check the puck away before it gets there. If the puck is on the glove side, put your stick between your skates, and keep your glove out of the net.

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Breakaways - If you have a defender, let the defender guard the passing lane, staying in between the players. You guard the shooter. Don't worry about the other player until the puck is passed. If the shooter takes a shot, block it. If he passes, and your d-man doesn't get it, either slide and stack the pads, or T-push across. If he looks like he's gonna shoot, stack 'em. If he's going to contain it, T-push. Whatever you do - do it fast.
If you don't have a defender, guard the shooter, and be ready to start stacking those pads.

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Stacking the pads - Usually only used in the above situation. Try not to use this too much, because it's hard to get out of, and tends to leave quite a bit of open net over you. But when you have to, let's say you have to stack them to the left - your glove side. Push out of your stance with your right leg, and put your left leg up...then slide your right leg under there. Make sure there's a solid wall, and your top leg isn't slanted. If your stick is under you, slide it out to cover the ice, and keep your glove up, ready to catch the puck if it goes up there. If your glove is under you, keep your glove down to cover the ice, and wave your stick and blocker, and try to knock down the puck. Try to use this as little as necessary.

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Don't go down before shots. Even if you go down when the player is winding up, he still has time to redirect his shot. When he shoots, watch the puck. Is it going down? Should you go butterfly? Is it going up? Should you blocker it or try to glove it? Don't go down before the shot. It lets the shooter have a lot more net, and it's harder for you to get up in time.

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PLAY YOUR ANGLES! I cannot emphasize enough how important angles are. When someone is on a breakaway, come up to the hashmarks, and as they come back down. It cuts down the angles a lot. To see how important angles are, get someone to stand in a net, in a goalie stance, on the goal line. Lot of net to shoot at, huh? Now get them to move out to the top of the crease. A lot less net, huh? That's how important it is to play your angles! Don't be afraid to come to the top of the crease. If the play is in your zone, don't go farther than the top of the crease. If there's someone beside you, waiting to tip the puck in, don't come out too far. Assess the situation, and find out where all the players are, and play the angles accordingly. Play the angles, but don't get caught out of position. If you're not sure how much net you're leaving open, tap the posts behind you, and orient yourself. If you're fast with your glove, leave a little bit more room on the glove side.

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Do your stretches everyday. Do mid to long -term stretches everyday, and do some short term stretches before every game and practice.

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I'll put up more later. Email me if you need something.