Not much weight without proof: http://imgur.com/YiyEke0
Most of mine has come from a single post about uses for a Raspberry Pi[1].
I've done a lot wrong when trying to build site traffic (multiple domain/url scheme changes, etc) so I think I would be doing much better if I had focused more in the past.
1. http://magnatecha.com/things-i-do-with-my-raspberry-pi/