I'm always wondering how many calories I burn while doing specific activities. It's not always easy to figure out because many of the websites I go to do not tailor information to my body weight.
This website has a great tool at the very bottom of the page where you can enter your weight and the amount of time you did an activity and it will generate an entire page of activities to choose from!
http://primusweb.com/fitnesspartner/jumpsite/calculat.htm
You may be surprised either at how little or how many calories you are actually burning.