It is interesting to see that according to Google Trends there appears to be less searching on the broad topic of open source, but an increase in searches on specific open source applications such as Joomla and Drupal.
Bibliothekia has never been to ALA, but my spies tell me that open source applications are becoming one of the "watch this spaces" issues at this and other US library conferences. There is also a growing amount of discussion on open source solutions on library blogs.
It has been fascinating to watch as a growing number of libraries migrate to services such as Koha or Evergreen. Bibliothekia is planning to keep an eye on this one. I have already loaded the recently released Koha 3.0.0 RC1 onto a flash drive (thanks Bart for identifying the problem with the dodgy flash drive), so it will be fun to see what Koha can actually do and how this compares to commercial integrated library system solutions. According to the Koha 3.0.0 release notes, the Koha search engine "features such as relevance ranking, field weighting, truncation, stemming, use of fuzzy operators, language-specific indexing, sorting, etc... Koha 3 can handle Chinese, Japanese, and even right-to-left languages such as Arabic and Hebrew."