Try the seomoz blog, the seobook blog, keep up with searchengineland, follow the big SEO guys on twitter, the all post their links.
Be aware that the basis of technique at SEOMoz is creating linkbait and indirectly/directly begging for links on Twitter. There is still some interesting techniques on there though, and some fun seo experiments they have done.
Don't buy a paper book, by the time a book get's published it will be out of date, however, give the pagerank algo a good read and make sure you understand it, a lot of people on here do not understand how it works and get gonfused when a site with little or no backlinks gains a lot of pagerank, if you read the algo you would know exactly why.
Stay ahead of the game, late 2011 everyone was talking about social signals, now we're all taking about page layout... things move fast.