On February 12, 2009, Microsoft announced a $250,000 USD reward for information. Microsoft's Conficker Worm page has details. Bounties have been successful in the past, e.g. Netsky's author, Sven Jaschen.
Our January 30th post provided a Downadup domain blocklist for the month of February. While the domains no longer need to be blocked, such a list can still be useful to monitor for infected machines within your own network.