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http://www.prolifictec.com consultancy web site
http://tech.groups.yahoo.com/group/sensorforum specialized group dedicated to sensors (maintained by yours truly)
I was impressed by this recent post on meta.SO : On large communities decaying over time, being nice or mean, and Stack Overflow. I'm deeply impressed by the references, which it's using : Why Online Communities Decay Over Time and A Group Is Its Own Worst Enemy. The latter is long, but it's well worth reading.