Crash Course in Learning Theory
The long version...
• Talk to the brain first, mind second.
Even if a learner is personally motivated to learn a topic, if the learning content itself isn't motivating, the learner's brain will do everything possible to look for something more interesting. This applies to both getting and keeping attention, as well as memory. Remember, you can't do anything until you get past the brain's crap filter! And to the brain, a dry, dull, academic explanation is definitely CRAP (regardless of how much your mind cares about the topic).
Learning is not a one-way "push" model.
Learners are not "empty vessels" waiting to be filled with content pushed into it by an expert, blogger, author, etc. Learning is something that happens between the learner's ears--it's a form of co-creation between the learner and the learning experience. You can't create new pathways in someone's head... your job is to create an environment where the chances of the learner "getting it" in the way that you intend are as high as possible.
• Provide a meaningful benefit for each topic, in the form of "why you should care about this" scenario.
Learning is much more effective if the learner's brain knows why what you're about to talk about matters. The benefit and/or reason why you should learn something needs to come before the actual content. Otherwise, the learner's brain gets to the end of what you're telling them and says, "Oh, NOW you tell me. If you'd said that earlier, I would have paid more attention..." This process of not-paying-attention is not completely within the learner's conscious control so, like I said, even if the person is motivated to learn this thing, their brain can still tune out during specific parts that don't start with a compelling benefit.
To find a "meaningful benefit", play the "Why? Who Cares? So What?" game with someone else. Describe the thing you're trying to explain, to which the other person asks, "Why?" Provide an answer, to which the person then asks, "Who cares?". Provide an answer, to which the person asks, "So?" At this point, when you're nearly ready to kill them for not getting it, you probably have the thing you should have said instead of whatever you said first (and second). The most compelling and motivating reason/benefit is almost always the thing you say only after you've answered at least three "Yeah, but WHY do I care?" questions.
• Use visuals! 
We are all visual creatures, and the brian can process visual information far more efficiently than words. These pictures can come in many forms:
* Info graphic or diagram
* Visual metaphor
* Picture of the thing being described, with annotations
* Picture of the end state
* Picture designed to create attention and recall
• Use redundancy to increase understanding and retention.
Redundancy doesn't mean repetition--it means "say the same thing again, but differently." And "differently" can mean:
* From a different perspective.
* Using a different information channel (channels include things like Graphics, Examples, Prose explanations, step-by-step instruction/tutorial, case studies, exercises, summaries, bullet points, commentary, devil's advocate, Q & A, personal POV, etc.)
Also, the more senses you engage, the greater the potential for retention and recall. Even having a bowl of just-popped popcorn or the smell of freshly-baked cookies while learning, can make a difference. Bummer about web-delivered content, though...
Being terse is good for a reference document, but deadly in learning content. The best learning experience considers the way you'd learn that particular thing in real life -- but offers it in a safe, simulated, compressed form. Real-life learning is never terse; it's choas and confusion punctuated with moments of insight ("Ah-ha!") and clarity. It's a wave, not a straight line. A learning blog, book, or classroom shouldn't try to straighten it out!
• Maintain interest with variety and surprise.
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