We all know what a big hit the Cash for Clunkers program was in autos. The Department of Energy liked the idea so much it will implement a similar idea for appliances this fall:
http://www.usatoday.com/money/industries/environment/2009-08-25-appliances-cash-for-clunkers_N.htmOnly problem is that the DoE has succeeded in making its program hopelessly complicated -- appliances eligible for the program in one state may not be eligible in another due to differing energy priorities that vary state to state.
Anyway, the clunkers idea is catching on in other industries as well. You can even trade in an old motor for a new one thanks to a clunkers-inspired program from Lin Engineering:
http://www.linengineering.com/line/contents/stepmotors/CFC.aspx
Expect to see more promotions like this as the idea permeates industry.