Mahout & Solr

[Mark]

"Apache Mahout is a new Apache TLP project to create scalable, machine 
learning algorithms under the Apache license. It is related to other 
Apache Lucene projects and integrates well with Solr."

How does Mahout integrate well with Solr? Can someone explain a brief 
overview on whats available. I'm guessing one of the features would be 
the replacing of the Carrot2 clustering algorithm with something a 
little more sophisticated?

Thanks