Yahoo! is hosting a summit on open source content management systems March 22nd and 23rd on their campus in Sunnyvale, CA. The current set of proposals includes projects like Alfresco, Drupal, Joomla!, Plone, Siteframe, as well as a number of sessions that are relevant to any CMS. They’ve opened up voting on the sessions to the general public, and you still have a day to submit your votes.