Need urls for downloadable/ printable/ PDF[-equivalent] book/lets in English on matters such as "What is RSS?"; "Social networks"; "How to Google"; "Web 2.0"; etc., suitable for socially-challenged/ casual/ older Internet users. Any ideas where to find such?

Yes, I do know of http://www.55fun.com/ but it's, well... too intellectually challenging, too playful for the redistribution target I have in mind; "55" is essentially a programmers' sandbox, whereas what I have in mind would be more like an... IKEA catalog?.... only for webby software, with methods/ descriptions and contextual usage scenarios of the many wonderful new ways in which one can get cancer[*] by staring in fear and awe at a computer screen.
http://www.55fun.com/pic/55ways-cover.jpg
[^*] kidding, but that's the common "folk-wisdom" consensus.

One could assemble a set of such pages from Wikipedia, edit them for clarity and ease, and then convert them into a print-on-demand book at CafePress, provided you keep to the GNU license (e.g. you need to cite the license in the book and make your editings available online in digital format). Not that that really answers your question...

Yeah, well, one could always do something special for intended purpose and distribution method. I simply hoped that someone here already might have come across a repository of ready-made up "empirical" capsule descriptions of such (and pre-wrapped for printout, too!). Because, while I personally may instinctively be getting the gist of new offerings to whittle away time/ fight entropy with New! Improved! Chaos™ without needing to know the scope beyond black box level, how do you explain to culturally sophisticated, yet technically naïve people, the distinctions of such by-definition otherwordly concepts as (never mind added complexity of, e.g. automagick RSS-notifications of updates from; start with) "apps" running within "a social platform" (one among many that may be) present on a page belonging to a website currently shown on the screen? Each abstraction may be simple enough, together they're impentrable. "Browser? you mean this here computer?" ;-))

The closest to what I'm looking for THAT I KNOW OF is the Webscape section of the BBC "Click" programme
http://www.bbcworldnews.com/Pages/ProgrammeFeature.aspx?id=18&FeatureID=854 (curently showcasing GIMP, Disney Printstation, Splandoo, and the LOLcat-editor(?) icanhazcheezburger), but then it caters to all age groups with prevalence of the younger lot, and the beyond-cutesy apps.

Watching my elderly charges attempt to make sense of most individual apps there on offer is like a preview of upcoming cinema nouveau-verité "Excercises in Well-Tempered Frustration and Anger," the one Cannes was all abuzz. Therefore I now steer them away from the web, and onto the more unified, and "limited-ornamentality" of RSS news flows. I used to recommend dedicated RSS clients, but the duality of switching back and forth to a browser wasn't worth the trouble. So now I simply make them use the http://google.com/reader/m/view MOBILE Reader (on a desktop) with but 9 items at a glance at any one time, and few possibilities to con-gfu-dood-luse the user.