Welcome to the Q&A Forum

Wiep's insanely actionable post that really hits a raw nerve for us SEOs - what to do with failed linkbaits (that's our egos on the line there for one): http://wiep.net/talk/link-building/linkbait-failed-now-what/

Needless to say, Mike's Excel for SEOs guide  http://www.distilled.co.uk/excel-for-seo/

The 'Poke the Box' Workbook from The Domino Project & Seth Godin (debate the value of a PDF versus online, but its still vv good): http://www.thedominoproject.com/2011/03/poke-the-box-the-workbook.html

Conversion Rate Factory's traditional dissection of key marketing principles. I love how they publish less often, but just killers stuff each and everytime - I know to always click on them. (Their case studies are especially awesome). Here's just one gem: http://www.conversion-rate-experts.com/100-year-old-persuasion-strategy/

Ah, the most epic YOUmoz post of all time perhaps - the only problem with this in "blog post" format is its slightly more difficult to use: http://www.seomoz.org/blog/the-noob-guide-to-online-marketing-with-giant-infographic-11928

That's some of my most recent finds on StumbleUpon - sure there's plenty more!

Ciao,

Ed

Can't not say I'm a fan of the Distilled blog! http://www.distilled.net/blog/

And there's lots of great (especially for link building) posts on SEER Interactive: http://www.seerinteractive.com/blog/

Finally, there's just been too many good posts recently from Ross Hudgens to ignore him anymore: http://www.rosshudgens.com/

Have you come across Dave Navarro? Awesome library of free downloadable PDF workbooks: http://www.thelaunchcoach.com/thelibrary (behind an opt-in list)

Similar stuff here: http://www.perrymarshall.com/guerrilla-marketing/ (the same content is packaged into a booklet or audio CD to capture people's addresses and mail a sales letter. Multi-purposing content for list building and link building.

You've also got to be able to emulate The Oatmeal  http://theoatmeal.com/story/reddit_how

Seth Godin's 'Linchpin' video was release free yesterday (TL;DR - cut straight to the pw + link at the bottom) http://sethgodin.typepad.com/seths_blog/2011/04/the-paperback-choice-and-the-video-dilemma.html

The trouble is, most of this content is behind opt-in lists or otherwise exclusive to a "tribe". I've a library of my favourite digital downloads I could dropbox you?