Going Green: A Fad or the Future?

Going green has definitely been the catch phrase of the year. I've viewed it with skepticism, because sometimes when you hear about a product that's supposed to be environmentally friendly, that's not always the case. Sometimes, its just good advertising, but not entirely factual.
Still, I'm down with the stuff that makes a difference. I recycle our garbage, use those expensive lightbulbs that take forever to warm up, and pump my gas early in the morning. But that's about it.
Last week however, I decided to count how many takeout cups I used over the course of 7 days. You see, I'm in the car all the time, dragging my trolls to school, to tutoring, and on errands. I end up eating whole meals in the car and drinking everything from coffee to water to iced tea on the go.
In one week I used 15 paper or plastic takeout cups. Even though these materials can be recycled, I decided that was 15 too many. 15 times 52 is 780 cups a year. That's 780 too many!
So I've loaded up on reusable containers and though there is a hassle-factor to cleaning these and actually remembering to carry them all with me each morning, I feel good about making this change.
Have you changed your behavior at all lately in order to be greener?