It took me quite a while to see a real difference (though I started out quite a bit heavier than you are now). Don't worry -- though it's hard to see day-by-day, the changes are happening. You'll get up one morning (soon, I promise!) and your clothes will be loose, and then soon after that just way too big.
You're doing great -- getting started is the hardest part. Don't get discouraged now!
Starting Weight: 260 lbs. (November 2010)
Quasi-Maintenance: 165 lbs. (June 2011)
Goal Weight: 150 lbs. (reached December 8, 2011)
Size 22W to Size 4
Currently maintaining within 5 lbs. (+ or -) of goal. I weigh daily, but also use a tape measure and the fit of my clothes to guage how well I'm doing.