I've introduced myself before, a few months ago, but I think it's time again, since I fell off the bandwagon.
My name is Star and I'm a 22 year old mother of one. I've recently hit over 300lbs, and I've realized it's time to really buckle down. I need to be healthier not only for myself, but for my daughter.
I fell off the bandwagon last time because of a few reasons. (1) I tore the meniscus on my knee in the first week of my new diet and exercise regimen. (2) I lost my job due to injuring my knee (long story short, I had to quit) (3) During the first month of the knee injury I felt useless to my family and (4) The result of feeling useless was a long-standing depression. I recently found my will power again after seeing myself in some pictures. Amazing what the power of photo can do.
My support in real life lacks a lot. My mother, being only slightly overweight, likes to try to "encourage" me, but is overbearing and pushy about it. She has been like this since I became slightly overweight during puberty. My husband refuses to give up soda, hot dogs, hot pockets, and whatever other things he eats that are loaded with calories and sugars. (doesn't help that he works at George Weston Bakeries and can bring home cakes all the time >.<)
I'm hoping to stay motivated this time. I even created a livejournal account just for dieting purposes.

Congratulations on making the decision to start this journey. 
star you can do this. what plan are you choosing? remember this isnt a temporary fix... your life habits need to change for you to lose the weight and keep it off but the great thing is YOU CAN DO IT! Having health alternatives to hubby's food would be great. I couldnt handle seeing that stuff everyday (can he keep it in a certain shelf or something?)
I'm going to find myself some "belly dancing" videos as I was told it's low impact for my knee (I talked to my step-father's cousin who is a Chiropractor and he treats torn meniscus if it's non-surgical) and I'm going to do Wii Boxing. The last part sounds funny, but you really sweat doing it! And gives your arms a nice workout.