There are a number of free weight loss support sites out there. SparkPeople.com is a good one that many people like - personally, it wasn't for me, but it is worth checking out, as it has worked for many people.
FitDay.com is a wonderful free food and exercise tracking system. You'll be very aware of what you are eating, how your diet is shaping up nutritionally, etc.
WeightWatchers.com has free message boards (you just have to register - which doesn't cost anything). You have to pay to access the program information, but the boards are not always geared just to the specific program, but are supportive of healthful eating and exercise in general.

www.fitday.com
you can track like what you've eaten, fitness, and weight loss and stuff... it's pretty cool
or
www.weightlossbuddy.com
both good sites

I LOVE sparkpeople.com And everyone I have reffered to it love it! Good luck!

The site below has good information on diet / fitness / running / exercise. Good luck.