There are many SEO and PPC websites, blogs and forums online that all claim to have the latest and most up to date information. Here are a few that the good people at Creative Confusion read regularly.
Webmasterworld (www.webmasterworld.com)
The largest and most active webmaster forum online. The wealth of SEO and PPC information here is astounding. A must read.
Search Engine Land (www.searchengineland.com)
News and industry information for the SEM and Search engine world.
SEO Chat (www.seochat.com)
Large active forums, articles and tools for the SEO world.
Matt Cutts (www.mattcutts.com)
A software engineer and head of the web spam team at Google, some times posts some very insightful and useful information over at his blog.
SE Round Table (www.seroundtable.com)
Up to date blog focusing on the business side of the SEM industry.
SEO Book (www.seobook.com)
The SEO Book features tools, online training and an up to date informative blog written by Aaron Wall.
David Naylor (www.davidnaylor.co.uk/blog/)
Informative and some times funny blog by David Naylor, he knows a thing or two about search.
Shoe Money (www.shoemoney.com)
Love him or hate him, this guy knows how to make money online!
SEO Moz (www.seomoz.org)
This site has it all an informative blog, tools and premium content