I know how you feel, Laura. I have a bad knee (slipped kneecap) and a hernia so I have to do low-impact stuff. I find that my favorite thing is my recumbant exercise bike. I love to watch TV while I exercise, not for the entertainment value, but because seeing the thin, gorgeous girls on TV reminds me that I never want to be BIG again.
The recumbent bike is excellent for people with back and knee problems since the pedals are in front of you instead of under you. I ordered my bike for like $120 at walmart.com! EXCELLENT investment! And if you set the tension high, you can flatten your tummy while you work out, too.
