I'm an avid runner and thus I bought an Adidas miCoach some time ago (comparable to Nike+; imagine a supercharged and webbased heart rate monitor with attached coaching via earphones).

They provide a webcal address, which I can use to import my running schedule in Outlook et. al. As I like to have as less In baskets as possible, I thought about importing this into RTM as well. I think this would also come handy for those of us who are members of a team/company that uses some bigger groupware.