Drupal 7 with Display Suite and Apache SOLR search environments
The second branch of Display Suite has full support for Apache Solr pages, it basically takes it over by default. This hasn't been committed to the first branch as it involves to much changes.

The second branch doesn't have much changes - you might get some notices first, but re-saving the Display configuration solves those. 

The biggest change is the default template files which are a little different because the 'Hide empty regions' option has been removed. The logic for collapsing regions is now in the template file itself. That's why we now ship with a 2 column and 2 column fluid template for instance.