Upgrading Ruby and Rails on Mac OSX and Moving to Mongrel
Past posts have probably nailed me by this point as a huge fan of Ruby on Rails and the Ruby language in particular.
While I think a huge mythology now surrounds how much more productive it makes you which causes difficulty in separating the hype from reality, my personal experience has made me a raver about it in terms of just getting things done. In one (ok, mostly sleepless) weekend, I managed to get up a canvassing and get out the vote application, web enabled across the internet that was used successfully and to great effect in a Canadian federal leadership campaign (and the person ran rings around the other candidate partly because of its contribution). The party in question had been unable in several years of trying to accomplish the same thing.