SEO is a never ending journey and there is always something new to learn, not least because SEO is always evolving thanks to Google continually pushing the boundaries of search. With that in mind in addtion to reading SEO Andy and the SEO books I recommend, I highly advise you take a look at my 50 favourite SEO resources.
Search Engine Land - latest seo news
SEO Moz - great seo blog
Search Engine Roundtable
Search Engine Journal
SEO by the Sea
Dave Naylor - awesome resource
Distilled Blog - great range of seo topics
Google Webmasters Blog - from the horses mouth
Chris Brogan's blog
Top Rank Marketing - ran by @leeodden
Did I miss your blog or favourite resource? Leave a comment