Twitter rolled out a beta feature for lists to a part of Twitter's user base, according to Techcrunch. This summarizes the list feature:
Setting up a list is simple. Currently, the homepage features a Lists banner that allows you to start simply by clicking on the “Create a new list” button. Once you do this, an overlay appears and you just type in the list name (which Twitter then converts into a permalink along the lines of twitter.com/USERNAME/LISTNAME), and set the list to be public or private. This is obviously an important distinction as the public one, others will be able to see, while the private one will be for your eyes only.
On the right hand column of you Twitter.com homepage, you will see a new “lists” area under you bio. Clicking on this will take you to your list overview page where you can manage your own lists, as well as see other user’s public lists that you are a part of. Also, on user profile pages you will see that the users’ lists are now listed under the “Favorites” area in the right hand toolbar.
Clicking on any of these lists will take you to a stream of just the users followed by that list. Basically, this is a filter, if used the right way. This is something Twitter proper has long needed (though plenty of third party services like Brizzly have stepped in to offer it).
Unfortunately, adding people to your list is not as easy as it should be. The reason for this is that there is no user search functionality. Instead, you have to either go to your “following” page, or to that person’s profile to manually add them.
I have created my own list - for "friends." I'm still playing with this feature. As of now, its main benefit for me is to filter my feed according to my own personal preferences.
