At their worst, I'll admit, open-source software communities can breed flame wars, ugly breakups and needlessly forked development roadmaps. But at their best, you have to admit, open-source crowds share ideas, solve practical problems and tip hats at each others' successes.
Witness the Drupal community's post congratulating the developers of Joomla -- arguably Drupal's biggest competitor for mindshare -- on their new release.
