After having tried just about everything under the sun, I'm now a firm believer in elliptical machines.
I've never been able to become a dedicated runner, outside or on a treadmill. I also tried joining a gym so I'd have access to the weights and exercise machines but found myself struggling to even go. The 2 hours commitment for me was just too much each night (20 minutes to change after getting home, 15 minute drive to the gym, 45 minute workout, 15 minute drive home, change and shower...).
I was finally able to convince my wife that buying an elliptical made sense and we've both been very happy with the decision. We bought a middle of the road Nordictrack which was about equal in cost to a gym membership for a year. Now we each spend 30 minutes on it after work while we watch the news. Couldn't be better.