Links:

About Advertising
Adland
Advertising Age Magazine
Advertising College
Advertising Council
Advertising Educational Foundation
Advertising Photographers of America
Advertising Research Foundation
Adweak
Adweek Magazine
American Advertising Federation (AAF)
American Association of Advertising Agencies (AAAA)
American Business Media
American Marketing Association (AMA)
Advertising Marketing Review
Artists In Print (AIP)
Association of Hispanic Advertising Agencies
Association of Independent Commercial Producers (AICP)
Association of Independent Creative Editors
Association of National Advertisers
BA Exhibits
Bay Area Advertising Relief Committee (BAARC)
Buying or selling a home? See Herb Bass!
The Creative Department
The Direct Marketing Association
The Direct Marketing Association:
Northern California Chapter
Financial Communications Society
Interactive Advertising Bureau (IAB)
Magazine Publishers of America (MPA) 
MarketingSherpa
National Advertising Review Council
Newspaper Association of America
Online Publishers Association
Outdoor Advertising Association of America
Radio Advertising Bureau
SF American Marketing Association (SF AMA)
Syndicate Conference
Television Bureau of Advertising
TNS Media Intelligence
Very Funny Ads
World Advertising Research Center (WARC)

Blogs:

AdLand

AdPulp

AdRants

AdVerb Blog

Advertising/Design
Goodness

BlogPulse

BrandAutopsy

Mike Davidson

Internet Ad Sales

Jaffe Juice

MarketingVox

TopRankBlog