Losing weight harder as you approach your ideal weight?

Does it become harder to lose weight as you approach your ideal weight?

I’m about 5’10” male, 28 years old. About 3 months ago, I was at 175 lbs. After working out almost daily (using P90X) and eating mostly healthy, I’m now at 160 lbs. So, on average, I lost about 5 pounds per month.

I want to be at around 150 lbs. The question is, for those who have lost enough to be at their ideal weight, did it get harder to shed off extra pounds as you were getting closer? Did you have to reduce your intake and exercise more? Or.. did you just pretty much eat the same (healthy) and exercise the same amount?

Note: if my average holds, I should be 150 lbs in about 2 months (the end of Nov, 2010)