sites everone should know about...
tsn.com (now gonna charge 19.95 for the year, sigh), cbssportsline.com
espn.com has plenty of news but not much on the fantasy help
rotonews and rotowire used to be good, then went pay, id really rather not pay if i can get away with it
and there are plenty more
search for FANTASY BASEBALL on google.com
and check ever pages LINKS page to other sites.
this isnt brain surgery people
and there is no one best source. read ALL these sites, read ALL the magazines, watch ESPN every day, and come to your own conclusions.