Check out the agenda, register, and (if you or your company have the means) consider sponsoring the conference. O'Reilly is already signed up to sponsor (thank you!) with a couple more companies lined up.
This is a great chance to meet Matz and many of the leaders of the Ruby community and the software development industry in general.
Even if you’re not speaking, bring your ideas. Some big ideas (and code) have come out of conferences past. You’d be surprised what can be accomplished in between the sessions of a 3-day conference.