Just got a media blast giving a small taste of the Fall Update to come. One of the features that will be coming December 4th with the update (yes that’s the scheduled date for the fall update - mark your calendars) you will be able to spy on your friend’s friends list - similar to the abilities of sites like myspace and facebook. So you can see all those cool guys that are friends with MajorNelson, or those unfortunately enough to be added to my list :-) You don’t want your precious 100 contacts exposed to the outside world? Well you are in luck, they have also gave you the ability to block peoples ability to see your friends list.
Personally I don’t have any reason to hide my friends list - but it has caused quite a stir around the interwebz - so luckily they were smart enough to include that option….oh and one more thing - its pretty likely that MajorNelson will block his list so its doubtful you will get to see who is cool enough to make his top 100 
Update: you can all ready see these features on your zune card, and as of now major’s list is public, perhaps I was wrong