Apple has updated its MobileMe page. By far the most exciting stuff for us is the "find your iPhone" stuff. But that isn't it. There is now going to be a free iDisk .app that will allow you to do some fun stuff on the iPhone with your files. This includes things like the ability to view your pdf, office, etc. files (assuming over 3G) that are on your MobileMe account. Also, you can share your MobileMe files with your contacts using the iDisk.app.
From Apple Below:
Sometimes it’s your keys. Other times it’s your glasses. Misplacing things happens all the time. Now, if you misplace your iPhone, Find My iPhone can help you find it.