What I use currently:
BaseballAmerica - good reads and coverage for the MLB draft
Baseball Prospectus - very interesting articles and access to Pecota and fantasy manager. The downside is a lot their most interest writers have left.
Baseballnotebook - good cheap projections
These 3 costs about $120 a year combined, but it's not purely for fantasy baseball.
What I've used
Rotoworld - pure garbage, waste of money, does not really tell me anything I dont know already. On the bright side, it's dirt cheap.
BaseballHQ - I've used this before, it's not bad but it's pretty expensive.
ESPN - simliar to rotoworld, but I got it for free for a year.