UPDATE: New post on getting Multicore Solr 3.4 running on Ubuntu 10.04
Apache Solr Search engine for web sites
These are guides to installing Apache Solr and integrating it with Drupal
With Drupal 7 I was forced to move from Luceen to Apache Solr for my search engine. I found that there are lots of documents on how to do Solr 1.4.1 with Drupal 6 but but with Drupal 7 not so much. I also wanted the added complexity of running mutilple Drupal sites off of one multicore Solr instance for Test and another set of Drupal sites off of another Solr instance with just one Tomcat server for both.