There are a number of posts about this on meta.stackexchange.com - see, for instance, this one. I would post links to others but as a newbie I'm limited to one/message. Hmm...
Interestingly, another StackExchange-based startup-oriented site I just started poking around in (startups.com) has exactly the same problem. Worse yet, some people have given me great answers for my questions there, and I can't vote for them!
Does anyone have experience with other Q&A sites? Is this particular to the ones focused on start-ups (perhaps because the questions asked tend to be more subjective and have no right answer), or is it just a function of age? Terribly ironic if communities of people distinguished by their ability to get new companies off the ground are not getting, well, the community off the ground...