Im looking to lose some extra weight after just having my son, if anybody knows of a really good site please let me know because im having trouble finding one. Thanks

www.sparkpeople.com
It gives you free meal plans, free exercise plans...you track your progress and it gives you stages of the diet which you have to complete. I love it there.
It also has forums and groups to join to keep you motivated.
I have yet to use it because I'm a procrastinator but the time I have spent on the website was Worth while.

www.calorie-count.com
forums..calculators telling you how many calories to consume. you can log your food and get daily grades..great community, forums :)

www.fitday.com
I swear by this site, 100% free, tracks exercise progress, counts calories, shows goals and has a journal. This helped me to lose 25 pounds and counting.
Good luck!