I don't think this site needs a detailed introduction as you can see it's a extreme sports based tracker.You can find everything your extreme heart wants.
This is the system bonus.
Also registration is open on weekends !How do i get Invites?
You will automatically receive five invites when you are promoted to Power User. If you are a power user and want more invites, you can buy them with karma points.
The tracker has the following categories :
Here's the browse page
Their forum is pretty big :
Follow the rules :