I know I've gotten a few IC people on the bandwagon over at endomondo.com, and my opinion is that it beats out some things we've used in the past like BuddyRunner, etc - the people who have tried it seem to agree. Also supports non-cardio activities, like weightlifting. :thrax:
Figured it was time to make an official IC team: http://www.endomondo.com/team/334612
Don't forget to install the free app on iPhone, Droid and BlackBerry - but if you don't have a phone, the site makes it easy to enter your workouts by tracing on a Google Map, etc.
I'll make a challenge for some fun when a few people get in the team. Join up and let the forums know!!
PS - some people say that the BlackBerry app is hard to install from the site sometimes. The endomondo blackberry app can be found in a few places, since it's free, but this one seems to work consistently: http://appworld.blackberry.com/webstore/content/7593