Sorry for the short notice, but the Orlando Ruby User's group is doing a Coding Dojo this week and I thought some of us would also be interested in participating.
So copied from their Meetup page:
"Come practice your programming skills with us this week. Instead of having speakers this month Trace Helms will be helping us run a coding dojo event. We will work on a problem together in Ruby, taking turns at being pilot and co-pilot on a pair-programming team while the audience watches. This is a great opportunity to watch other people program and learn from them! We will have a computer set up so there is no requirement to bring your own."