This is for those of you who play high gain or clean, I've recently found that the best way to get better clearer picking technique is not to play with clean tone, it's to play with very little, but noticeable gain, at the level of gain i'm talking about your sustain will be lower than if you play clean, so it will seem easier then when you actually turn on the clean channel.
IT's really, really, realllllllllllllllllllllyyy annoying at first but man does it help.
Alas for I am Jay! Reviver of very, very old threads!