First of all, congrats on your success so far!
Also, I love that little black dress you have on!
I do a similar thing as kuhrishuh. I try to take it 5 lbs. at a time and then celebrate even more when I hit every 10 lbs.
I think it's important to set goals that are Non Scale Victories (NSV's). That way, when you hit a plateau, you don't feel like you're not accomplishing anything, because you truly are!
You might want to have a goal of exercising X amount of hours for the week, or a goal of doing X amount of push ups every night while you watch t.v., as an example.
Or, you could have a goal of fitting into the next size of clothing that is smaller than what you're wearing currently.
HTH.
Mini-goals are great for motivation to keep us going for the long haul.
Mini Goal Advice
. Basically I focus on losing the next 10 lbs.. and getting into a new decade. I can usually celebrate one of those 10 lb goals (no actual reward, just lots of celebration on my part, lol) once every couple of months.. and then before I know it, I'm already coming up on my next 25 lb goal! 
I loved seeing all the signature goals while I was waiting my 20 days to get my own. And I realized how motivating it was to reach a goal, so I kept mine really small. Mine are all based on percentages and getting out of certain categories in the BMI chart and a few random goals just because I wanted to keep them small. The "getting out of the 180's" and especially the "half way to next goal" goals are purely because the surrounding goals were too far apart. I had fun choosing mine and I stare at them frequently.
