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More tips can be found at
http://www.topsemtips.com

Google guidelines for webmasters

Organizations

SEMPO
http://www.sempo.org/home

Ad Tech
http://www.ad-tech.com/

Forums and Industry Watching

Search Engine Watch
http://searchenginewatch.com/

Webmaster World
http://www.webmasterworld.com/

SEO Roundtable
http://www.seroundtable.com/

Blogs

Matt Cutts Blog (senior Google engineer)
http://www.mattcutts.com/blog/

The Elixir Systems SEO Blog

PPC

Yahoo Search Marketing

Google Adwords