OSCs Scott Stults and Michael Herndon are currently at Lucene Revolution and Scott was interviewed by CMSWire about the value of getting a Solr certification. You can watch his interview at the CMSWire coverage of day 1 of Lucene Revolution.
OSC principal Eric Pugh took part in developing the Solr certification test with Lucid Imagination. You can read his thoughts on the value of the Solr certification exam.