This website has some pretty interesting ideas:
www.cleanmpg.com
Guy responsible for the site is getting 50 mpg out of a regular Accord. Some of the techniques are a little on the radical side - pushing car to get it rolling, shutting it off at lights, etc..
Coast with the car in gear instead of in neutral if you can. It takes 0 fuel to have a car coast down in gear while idling requires some. So whatever distance you can coast in gear gives you that mileage for free.