Just received a pair of these webbed water sport gloves in the mail. I haven't tried them yet but, they are advertised to help you paddle faster, turn around faster, and provide a resistance like workout. I buy in to the idea enough to have bought a pair to test. 30 bucks including shipping won't break the bank I guess.
Ok, I came across some webbed gloves earlier this spring. Someone was selling a cheap, but nearly new wetty that I was picking up for a buddy. They threw in the webbed gloves. I threw one on the next day opposite of a claw glove. The webbed one let in more cold water through the stitching in the first 3 seconds of submersion than the reef shoes I experimented with around the same time. Neither made very much sense then, and makes less sense now.
BTW, paddling makes for better paddling. So does paddling with proper technique. No kevlar-neoprene webbed glove with the tightest of liquid seams will replace a poor lactic acid threshold and localized strength for the shoulders, lats, and triceps.