Give a hand to SabresFans.com for compiling a list (or maybe reposting it from somewhere else) of all the UFA's and RFA's (by team) currently
Cory Borlund also offers another compiled list without all the graphical hub-bub. He's also tracking where players are signing...
EDIT: TSN is tracking each roster and moves made by NHL teams. This is an excellent tool for following player movement throughout the league - and there will be a hell of a lot of it.