I have been running with Nike+ since November 2006.  Nike has just implemented the milestone functionality of the website.  For running specified distances you will receive a certificate, you can either print this certificate out or share the link with friends.  I have received 3 milestones, 100, 500, & 1000 miles.  I am just over 1000 miles on Nike+, so I am unsure of all of the award amounts.

Here is what my 1000 mile certificate looks like:


Nike+ 1000 milestone

 Go forth and collect your milestones!