Many articles (like this one by Wenger have written about the waves in knowledge management, the first focussing on technology, the second on people, the third on strategic capabilities). Nancy Dixon in Does your organisation have an asking problem? also talks about the challenges of software-based knowledge systems, and how to combine it with access to tacit knowledge in the heads of colleagues.
While planning our holiday in China (with a friend who lives in Beijing) I experienced a nice example of how technology (information from the internet) and people (talking to friends) interact for decision-making. Though we originally planned to visit Tibet from Liyang in southern China, a friend (met by coincidence in the train) alerted me to altitude sickness. I then started discussing it with my friend in Beijing and starting reading lots of things on the internet about altitude sickness (facts, like the name of a medicine, etc and personal accounts). Still it was hard to make a decision because the information is hard to evaluate and translate into a good decision (and information is sometimes contradictory). Till we talked to friends who have lived in Nepal. They have never been to Tibet, but were able to tell many stories about altitude sickness, what matters (for instance sleeping at the same altitude is very different from when you go up and sleep at a lower altitude). Knowing the friends, their experiences, their seriousness, etc. made it much easier to make a decision. So we are not going to Tibet and I'm very happy with our (well thought-through) decision!