I've completely re-written the friends list functionality to allow you to customize your friends in several ways.
If you click on the Edit friends button under your friends list, you will be taken to a new page that lists all your friends. You can use this page to add more GamerTags to your friends list, but more interesting is the 'Edit Friends Groups and Settings' button.
This button takes you to another new page where you can create up to 5 different groups for your friends. Each of these is groups is customizable - you can choose the name and colour for the group (including pink if it takes your fancy), whether other gamers can see the people on it, and even whether the gamers in the group will post news items to your Friend Feed.
The group you choose to be your default group will be the one that's chosen when you first go to your homepage, and also the one that new gamers you add to your list will go into.
If you have multiple groups, on your friends list on your homepage you will have a new dropdown with the groups in and also an option to select 'All'. If you choose this you'll see all the gamers in all of your friends lists, and they will also be colour coded in the group colours so you can easilly see who is in which group.
You also now have a button to send a Private Message to all of your friends (or all of your friends in a particular group).
The friend feed itself has been upgraded as well. You will now see when your friends Start or Complete games, as well and when they will achievements or change their status.
In other news, there is a new leaderboard for Gamers by Achievements Won. You can also now quote Private Messages when responding.