World:
Sign Craft
http://www.signcraft.com/
SignCraft has information on signage. The website includes links to old articles, sneak preview, gallery etc.

Sign Business Online
http://www.nbm.com/signbusiness/
Pratical information for the sign business professional

Sign Shop Network
http://www.signshop.com/
has articles, links to other related signage issues and industry news

Sign Web
http://www.signweb.com/
Sign news, how-to articles and product information for sign makers and buyers of signs. Source for sign making technology, equipment and supplies, with the online buyers guides, message boards, newsletters and software downloads.


India:
POP today
http://www.poptodaymag.com/
POP today is a magazine dedicated to link the POP manufacturers, suppliers and experts with the brand marketers, advertising professional, retailers and sales promotion firms.

Sign and Graphics
http://www.signandgraphics.com/
Sign and graphics is meant for the needs of the signage industry. has information related to graphics, signage, printing, etc.

Indian Printer and Publisher
http://www.indianprinterpublisher.com/
Magazine that covers all aspects of the printing industry.