Sami has a patch in there which used a older version of the solr client. with the current solr client in the SVN tree, his patch becomes much easier. your job would be to upgrade the patch and mail it back to him so he can update his blog, or post it as a patch for inclusion in nutch/contrib (if sami is ok with that). If you have issues with how to use the solr client api, solr-user is here to help.
I've done this. Apparently someone else has taken on the solr-nutch job and made it a bit more complicated (which is good for the long term) than sami's original patch -- https://issues.apache.org/jira/ browse/NUTCH-442
But we still use a version of Sami's patch that works on both trunk nutch and trunk solr (solrj.) I sent my changes to sami when we did it, if you need it let me know...
-b
