"Gamehack any edition of D&D with a new set of rules which change any one, or more, of the following:
- Changes Creative Agenda
- Changes tactical emphasis of play
- Changes how players can input
- Produces methods to improvise opposition
Email the details in 2 pages or less, (font not smaller than 10 point, smarty-pants)."
Full details over on Chris's blog; the header above is linked directly to the relevant post. Deadline's May 30.