Meg posted some interesting stuff in
this thread about how it seems to be more difficult for the formerly obese to maintain weight loss. Luckily, that has not been my experience! I maintain fairly easily on 1700-2000 calories with minimal exercise (I know, I should exercise more, for heart health if anything).
As WateRrat said, I did have a very long plateau. I did think my body was "done losing" and just happy at 140 lbs. I decided to move into maintenance mode and started eating more calories per day. The calories I ate per day were still very close to maintenance for someone of my height/weight/age/gender activity level, it was just a very small daily deficit. I ended up, very slowly over 9 months, losing another 13 lbs, without even trying. My weight has been stable at 127-130 since January 2006.
Although it's pure conjecture on my part (since I am not a doctor, nutrititionist or dietician), I like to think that the low calories of my initial weight loss (1400-1600) plan triggered something in my body that caused it to decide there just wasn't enough food in my environment. The body just put the brakes on, holding onto fat reserves JUST IN CASE I needed them. I "plateaued" for over 12 weeks.
When I started eating more, my body started thinking "oh, plenty of food here, no need to hold onto these fat reserves" and I was able to keep losing until I reached a weight where my body was really comfortable.
I don't really know if it's true or not, makes sense to me. I lost 50 lbs eating 1400-1600 calories a day. Weight loss stopped abruptly at 140 lbs, I tried eating less, I did more cardio, nothing. I start eating more (but still slightly below maintenance level) and lost more weight.
I know it sounds crazy, and I don't know if I would have had the patience to KNOWINGLY try it, but I like the advice to just chill and maintain for a couple of months. Let the body's feast/famine sensor re-set with lots of good, healthy food, keep up a little exercise. You have accomplished amazing things - you look absolutely beautiful.
Refresh yourself and then recommit in January, maybe? That does not mean that you can completely let go and eat RingDings. Treat this as a mini-maintenance, use it as a practice session for what your life as a maintainer will be. More calories = more healthy calories, not more nachos.