losing weight?

I have been trying to get down into the 170's. I have been stuck between 180 and 185 for quite some time. I have been working hard this week, and when I got on the scale today I was delighted to see 178.4.
Now i have to stay tough on myself and actually keep this going for a few weeks, it is very easy to creep back up, and I do not want that to happen!