I use this website which I find fantastic, it's free membership full of exercise programmes from yoga to kick boxing, its got a bmi tracker
, plans a daily workout programme for
you lots of little helpfull things for
you to keep on track, also has Personal Trainers online so you can chat to them for advice and encouragement. http://www.slimtree.com/login_new.asp
I hope that this helps, and jst to let you know you are not alone!