Since Django 1.4 does not have DISTINCT(ON) support for MySQL, here is a patch to add this featue : Download path a>
Recently we've been working on one project with Solr and Solarium. Strangely, content was indexed and fetched back with correct UTF8 characters, but somewhy search didn't work with UTF8. It appeared that problem is unrelated nor Solr neither Solarium. If You are using tomcat, open Your server.xml (usually /etc/tomcat6/server.