I was a lifetime member for 2 years recently when I lost 40 lbs (then quit going and gained 10 back ).

Everyone, regardless of weight, under 150 lbs gets 20 points a day (they used to have varying points like the 18-23 you mentioned). You then get activity points for any exercise. Basically, the activity points you earn = 1 point for every 100 calories you burn. If you worked out and burned 400 cal, you would get 4 points. They really have a sliding scale that has you look at your current weight, intensity of the exercise, and time involved. Then you earn a certain number of points. I just go by cal. burned b/c it's easier to figure out (and a little more accurate). The activity points you earn must be eaten the day they're earned or you lose them. The new program also has 35 "flex" points a week (basically 35 extra points) that you can use at your discretion. You can use them all in one day (if you want to pig out), use a little each day, or save them until you need them that week. At the end of the week the extra 35 points (or what's left of them) disappear and you start over.

I stopped doing WW when I started my current ironman training program. I burn somewhere between 900-2000 calories per day in exercise, and I can't seem to eat enough. I suppose I shouldn't be dieting while training, but you'd think the weight would come off itself (I wish).

Anyway, go to www.weightwatchers.com and you'll find many valuable resources. If you register (free) then you can join the chatrooms where people post questions/recipes/stories etc... and others answer their posts. I found it very helpful when on the program.
Best of luck!