Stolen from something I posted in the past:
Here are some of my favorite draft guides:
Draft Insiders - Frank Coyle puts out a pretty comprehensive draft guide. He's not always on target with his rankings or picks but he has info on most players that end up in training camp - even the un-drafted ones.
www.draftinsiders.com
NFL Draft Blitz - Jterrell turned me on to this last year and its worth checking out. It, like Draft Insiders, provides a comprehensive listing of players and evaluations. IIRC last year's guide was over 700 pages.
www.nfldraftblitz.com
Ourlads - Nice guide with some well written player evaluations. This guide isn't as deep as either of the previous guides but worth picking up.
www.ourlads.com
GMJR - I bought this guide last year for the first time and it impressed me with the number of players profiled. The book was several hundred pages thick and rates positions differently than others do. Worth checking out if you have $31 to spend.
http://gmjr.com