Found this on reddit. You may know some of the sites, you may not. But it is a nice all in one post to use as a resource to mine more data. http://www.reddit.com/r/fantasyfootball/comments/1nguxf/best_fantasy_resources_what_am_i_missing/
I like r/fantasyfootball during the season as much for the conversation as anything, though the advice can be good too.