I too like the Gaiam DVD. There is something really soothing about it that makes you feel better that you did it.
I just invested in Wii Fit Plus and I have to say that I am surprised at how much I like it. I was a little skeptical but my husband was really excited about it. The overall program is really good -- keeps things interesting and fun. The yoga is excellent because it can measure your balance to correct your pose, which is essential with getting a good yoga workout. I used take classes where the instructor would come over to gently show us where to move to get into a better position. So this is like having a personal trainer with you when you have time to fit in your workout. If you have Wii, it's definitely worth getting the fit program.
Otherwise, don't forget to get a good mat to work out on. The kids would probably love working out with you. My guy is too young but is very curious about what we are doing. Hopefully he will enjoy working out with us too eventually. Just keep it fun and light.
Good luck!