So I found these out messing around with Link. I'm not sure exactly how useful they'll be but I think with proper application they might atleast add something to Link's game.
1. Falling Up B
Run to the edge of a platform or stage and just as you are approaching the edge quickly press Up B. Be careful not to jump. If you time it just right, Link will begin his normal Up B on the ground but will slide off the edge of the platform or stage. If you do this off the stage you can DI toward the stage and Link will begin his Up B but grab the ledge half-way through. This technique was possible in Melee but this is the first time I've seen it in Brawl. The timing is pretty tricky. If you do it too early you'll do the regular standing Up B and if you do it too late you'll do the jumping Up B. If you hold B for too long the Up B will cancel as you leave the ledge giving you a small flash of light but no attack. When you do it right often Link will do his Up B scream twice in rapid succesion. It's really creepy. I'm not sure how useful this will be. Using it to grab the ledge is about the same speed as hugging and a bit more dangerous if you screw it up. But I have to say, holding a bomb then doing this off the edge of a stage with the double scream and having the bomb blow up in your hands during the invincibility frames leaving Link unscathed is probably the most terrifying thing I've seen in my life.
2. Boomerang Slide
Using the same idea as the first one, if you run toward the edge of a stage or platform and just as you are about to step off it throw your boomerang, for some inexplicable reason Link gets a boost in his horizontal momentum. This works whether you actually have your boomerang with you or not. This one seems a bit more useful because it actually speeds Link up quite a bit. You'll notice if you're doing it right. I'm not sure how you could use this to edgeguard because Link falls like a rock but it does get you around platform stages faster. I find it useful atleast.
If you're having trouble with these, don't be discouraged because the timing is pretty difficult. I don't have the equipment to make a proper video so if someone out there figures these out and could make a video it'd be great.
1. Falling Up B
Run to the edge of a platform or stage and just as you are approaching the edge quickly press Up B. Be careful not to jump. If you time it just right, Link will begin his normal Up B on the ground but will slide off the edge of the platform or stage. If you do this off the stage you can DI toward the stage and Link will begin his Up B but grab the ledge half-way through. This technique was possible in Melee but this is the first time I've seen it in Brawl. The timing is pretty tricky. If you do it too early you'll do the regular standing Up B and if you do it too late you'll do the jumping Up B. If you hold B for too long the Up B will cancel as you leave the ledge giving you a small flash of light but no attack. When you do it right often Link will do his Up B scream twice in rapid succesion. It's really creepy. I'm not sure how useful this will be. Using it to grab the ledge is about the same speed as hugging and a bit more dangerous if you screw it up. But I have to say, holding a bomb then doing this off the edge of a stage with the double scream and having the bomb blow up in your hands during the invincibility frames leaving Link unscathed is probably the most terrifying thing I've seen in my life.
2. Boomerang Slide
Using the same idea as the first one, if you run toward the edge of a stage or platform and just as you are about to step off it throw your boomerang, for some inexplicable reason Link gets a boost in his horizontal momentum. This works whether you actually have your boomerang with you or not. This one seems a bit more useful because it actually speeds Link up quite a bit. You'll notice if you're doing it right. I'm not sure how you could use this to edgeguard because Link falls like a rock but it does get you around platform stages faster. I find it useful atleast.
If you're having trouble with these, don't be discouraged because the timing is pretty difficult. I don't have the equipment to make a proper video so if someone out there figures these out and could make a video it'd be great.