Planetary Society Apophis Design Challenge updates

The Planetary Society has made 2 important announcements since the last time I reported on the Apophis Design Challenge to design a space mission to tag asteroid Apophis. First, a change was made to the rules to clarify a point about the tracking accuracy of the asteroid tagging method. Also, the Society announces that over 100 individuals and teams have registered in the competition.

Update on May 24: According to Spaceref, the Planetary Society released a press release today on the widespread interest in the competition. (I originally got the information from their Apophis Design Challenge web site).