[X, p, et al] Weightwatchers is what I'm doing, and last night I beat 5st 7lb after 8.5 months. Apart from the kaeselust, it's quite enjoyable, really. My diet is far better than it has ever been since I left home 9 years ago (and probably better than before then as well), and recently I added some exercise as well. At £4.75/week for the weighing (and optional chat/class afterwards that I never stay for), it's not cheap (especially when you need to lose 7 stone to become a Gold - non-paying - member), but they give out lots of helpful literature, and above all else it's a sane diet, which is why I've bothered with it at all.
More importantly than all this, I'm glad to see my DSL chose to remain alive this morning, after I forgot yet again to make sure it was okay when I left the house.