I don't like ESPN, TSN to tell you the truth. The 'experts' are not that knowledgeable IMO. But they are a good source of info since a lot of people seem to use them.
Fantasy Baseball Guide 2005 is a good one. Contributors like Peter Kruetzer, Alex Patton, etc. are very smart people. The great thing about this year's edition is the cost scans for the last 5 years. You can compare what they cost each year versus what they earned.
The problem with these magazines is that the info is dated. But you make the ultimate decision on player values with the knowledge that you get from the player capsules, stats along with current events.
"Think of how stupid the average person is, and realize half of them are stupider than that." ~George Carlin