Since a lot of news sites are using Microblogging as another way to get their headlines out, I think Twitter needs to adapt to this change too.
I think it would be very beneficial to the overall design if you could create "sets" of people you follow. This is similar in design to how Facebook and now MySpace has introduced sets of users.
This would allow a Twitter user create a set of news sources, a set of close friends, a set of co-workers, etc. and be able to switch between them.
This would be mondo excellent for people who follow hundreds if not thousands of other twitter users.
