The Waiver Wire Blog isn't currently active, but my other two sites are
Draftbug has daily fantasy sport contests for cash prizes. Compete in the daily baseball freeroll, or enter cash contests ranging from $1 to $55. Football is coming soon!
Daily Baseball Data has the following features:
1. Historical Batter vs. Pitcher Data for today's matchups
2. MLB Weather Dashboard with hour by hour forecasts for all games on one screen.
3. Bullpen Usage Report including recent pitch counts for all relievers