is because it's based on really nerdy, objective, technical pursuits where there are usually pretty discrete and/or black and white answers.

I'd be really interested to see how well it'll work on things that are more subjective.

The question that I think is more interesting about SO is what happens when 80%+ of the basic answers are already in there (how do I do x in y), and every answer will be RTFM (after about a year I think this is already starting to creep in). Will the site have less activity generally? Will the technology be providing us with so many more new questions it will off-set the decrease in questions about old tech available to ask? Will it become a big newb-on-newb-on-wiki-style-admin-person* fest?
*ie those who know the system well enough to game it to get mega-rep to the exclusion of all normal, helpful punters.

Though for the record I don't think it'll ever go as low as yahoo answers.

... waiting for a train, in a doctor's reception, under my desk where others can't see me...

Best use these devices were ever put to.

Can't you see that I'm social networking when I'm on a PC and drinking beer otherwise?

I'm sure I saw this quote on the bottom of slashdot a couple of months ago: "Work consists of whatever a body is obliged to do, and play consists of whatever a body is not obliged to do." (Mark Twain) In my experience this is absolutely true. I love my work/coding when I'm working on the frivolous bits of projects that I'm not going to get paid for, or perhaps even finish - the moment any obligation sets in it totally ceases to be fun, right?