To follow are a few resources you may find helpful;

Format Guide (PDF)
Format Guide 2.0 (PDF)
Postal Rate Card (PDF)

Publications
American Printer
DIRECT Magazine Online
DMANews
Graphic Arts Magazine
Graphic Arts Online
Printing Impressions
Printing News

Blogs
Print CEO-Print Industry News Blog
WhatTheyThinkGoingGreen -A Resource for Today's Green Business

Associations
Business Marketing Association of Chicago  (member)
Direct Marketing Assoc.  (member)
National Association for Printing Leadership
Printing Industries of America
The Printing Industry of Illinois / Indiana Association (member)
The Print Council

Green Business Associations
Green Business Alliance  (member)
Forest Stewardship Council (FSC)  (member)
Sustainable Forestry Initiative (SFI)  (member)
Programme for the Endorsement of Forest Certification (PEFC)  (member)
Direct Marketing Association (DMA)  (member)

More to come…