Sprize - would you credit it?
A nifty little idea from mysprize.com. As you can see from the graphic, they credit the difference to your account if you make a purchase and the price drops in the next 45 days. The sceptic in me (I strive not to meander into cynicism) says this can be completely automated so it never happens, but from a customer's perspective, fantastic added value!
Only currently available in Gap stores in the Vancouver area, I can see this idea catching on.