"Intelligent Sport Websites" not quite an oxymoron
Deadspin : Sports news without access, favor, or discretion.
Advanced NFL Stats: Intelligent analysis of America's game -- which is really a very strategic game, though hardly treated as such by coaches, announcers or league officials. Burke demonstrates using a variety of creative analytical tools, that coaches generally make shockingly poor strategic decisions, almost always too conservative, despite great stakes. Also Advanced NFL Stats Community
Team Rankings a data-driven perspective on sports
ESPN NBA playoff standings: Standings that show where a team really stands, accounting for recent team performance and the difficulty of games remaining (home/away and quality of opponent).
Cool standings: "Smart" standings for MLB, NFL and NHL as well as the NBA (yields slightly different than the espn results based on a different formula for estimating team strength)