At Drupalcon Chicago, Chris Pliakas and I presented Attain Apache Solr Coding Chops to an enthusiastic audience. While some of the content was similar to past presentations, we updated it to highlight more of the changes in the Drupal 7.x-1.x version, and Chris added new recipes for building customized search forms and results. A PDF of the slides is attached, and the video is available already on archive.org.
We also had a well-attended BoF (close to 30 people) to discuss future module development and a roadmap. We posted some notes to an issue on drupal.org. Please add comments there if you attended the BoF and want to elaborate on the discussion or if you are willing to volunteer to help with implementing the changes. Of particular note is plan I've proposed to mark 6.x-2.x as unsupported and forward/back port as appropriate to create a 6.x-3.x branch with a schema in sync with 7.x-1.x. I think this is necessary to make multi-site search feasible between Drupal 7 and Drupal 7 sites. The 6.x-2.x branch will not be able to use the same schema as 7.x-1.x due to the substantial schema changes that people at the BoF felt were appropriate to remove most of the node-specific schema fields (and hence better align with a generic entity API in Drupal 7), as well as changes to use trie date types by default for improved memory use and performance.