For a while it was IrishBlues run Cap Central, but lately there seems to be a lot of people saying that nhlnumbers.com has stepped it up and become the most accurate.
Cap Central:
http://www.hockeybuzz.com/cap-central/index.php
NHL Numbers:
http://www.nhlnumbers.com/
What do you use?
Cap Central:
http://www.hockeybuzz.com/cap-central/index.php
NHL Numbers:
http://www.nhlnumbers.com/
What do you use?