JOTI 2006 will be running 21-22 october this year
http://www.scout.org/wse/joti.shtml
I've run a few JOTI competitions before - but these were custom coded. They were based on a set of questions to be answered, plus online chat between the teams, and the ability to use lifelines (yes - very who wants to be a millionaire I know) - get a hint, ask another team and ask all other teams.
I won't be running one this year due to personal time constraints (although I will probably be in the JOTI IRC channels on the 21st).
However - I'd be interested to hear if any others will be running anything special for JOTI/JOTA this year - and if so - will it be integrated into a drupal based site? I mean - I can see forums for it etc - but is there something better out there?