Sphinn is the place for web, online, search, interactive and internet marketers to share news stories, talk within subject-specific discussion forums, build a network and stay informed of upcoming events.
Search Engine Land is a must read hub for news and information about search engine marketing, optimization and how search engines such as Google, Yahoo, Microsoft Live.com and Ask.com work for searchers.
PlugIM is a user driven internet marketing community. Submit content, share articles, comment on projects and promote your favorites to the front page. If it's internet marketing related, plug it on PlugIM.
A well-rounded view on search engines and search engine marketing from five segments of the Web population represented by senior members of the major SEO/SEM forums on the Internet.
A leading SEO resource focused on helping successful webmasters make money and increase their profits through driving targeted traffic to their sites by improving their rankings in Google and other major search engines.
Another great SEO, Social, and Internet Marketing Blog/Forum Community! Another great link to add to your Bookmarks. This one has lots of useful information on it and it's worth bookmarking it or subscribing to the RSS Feed.