Paul Preibisch (SL: Fire Centaur) has made available his simulation in Second Life of the Gulf oil spill for free.
i think it's a great teaching resource for (particularly science and geography) educators who might be able to use it in all sorts of ways, such as (but not limited to) a catalyst for inquiry-based learning and collaborative problem-solving.
you can learn more about what Paul has done from his recent blog entry.