One thing I've been meaning to track down the last couple of years is a site or database that lists all the fantasy performers from the previous year by their fantasy points total vs. the median amount for their position. This would be really helpful for example if you were trying to decide between drafting say the 6th best RB, versus a super-elite player at a different position.
I'm going to invent a scenario with made up numbers to try to illustrate what I mean.
Say for example, the median RB score is 180, and unnamed RB was coming off a 240 point season, that would make him a +60 player. If the media score for a TE was 100 and an unnamed TE was worth 220, that would make his differential +120. Obviously, the elite RBs are worth the most in terms of differential, but after the top two or three megastar RBs leave the board it's really handy to know these differential numbers to know which player is going to help your team the most.
Granted looking up the median is pretty easy to do, but it's a bit of a clunky process. I'm sure there are some sites out there that have a smarter and more sophisticated way of figuring out how much value a player is going to have vs. the waiver wire.