I just released Solr for WordPress 0.2.0. This release completely replaces the default WordPress search without any special setup. I have also added i18n support so people can translate it into different languages, integrated it into the default WordPress theme, and added support to enable or disable specific facets. This release should make it much easier for people to get setup and working correctly. As usual, please let me know of any bugs you might find by opening a report at https://bugs.launchpad.net/solr4wordpress.