One of my very favorite pieces of exercise equipment in the world is the elliptical. I used to have a treadmill and I hated it. HATED it. I never used it if I could help it, and one day I gave it to my dad (who, interesting, loves the thing...) and got an elliptical instead. I'd heard that the elliptical burned more calories by (basically) combining a treadmill and a stair stepper.
I first got my elliptical while dealing with a foot injury. I don't even remember how I hurt my foot, but walking on it was difficult. It was during the first, original 100-Mile Fitness Challenge back in the last quarter of 2009, and I wanted a way to exercise! I was failing the challenge miserably with that injured foot. It's been over 18 months since then, but I will say that buying my elliptical was hands-down the best fitness decision I've ever made. I not only finished the challenge that quarter, but I did it without pain. I felt great!
Ellipticals are a great way to get a good, solid cardio workout in. It doesn't put any stress or pressure on joints and it uses a full spread of muscles throughout your body. Most ellipticals come with many settings to add different resistance levels or provide different kinds of exercise. Some read your heart rate and track your calories burned. There's quite a wide range of prices for them too, and they're available at gyms as well, so they're pretty accessible.
Are you a fan of the elliptical?