basketball, Ken Pomeroy is the acknowledged wizard of stats at kenpom.com. Also see nropp.com for a fascinating blog on the college basketball.
Dr Bob has his own NFL matchup numbers at drbobsports.com. I think he also does so for NBA and college football.
Scoresandodds.com uses Statfox's numbers, but presents them in a different format which I prefer. The same numbers are available through virtually all of the on-line sports books.
For hockey, consult lippsman's daily post here during the season. He lists multiple sites with various info such as starting goalies every day,