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Snow Leopard already has Java installed on it, so it's pretty straightforward installing Apache Solr on Mac OS X versions 10.6 and above.
For Solr 3.5.0 on drupal 7
Assuming the above folders are in the Downloads folder:
Copy the solr-3.x config files from the module to the apache solr config
cp ~/Downloads/apachesolr/solr-conf/solr-3.x/* ~/Downloads/apache-solr-3.5.0/example/solr/conf
CD into the example directory
Start the Solr server
java -jar start.jar
To install Apache Solr on Tomcat in a Mac environment, see http://drupal.org/node/714642