We're planning on migrating the community back-end for Igniterealtime.org from Jive Forums to Clearspace on Wednesday. I'm pretty excited about the change, but it will require a couple of hours of downtime on the site. I'll post a more specific outage estimate in the forums as Wednesday approaches. If you're interested in getting a preview of what the updated site will look like, check out http://beta.igniterealtime.org.
Update: The migration has been completed, beta.igniterealtime.org has been removed.