Twitter Lists allow users to create follow lists that are separate from their main account, and whose tweets won't appear on their twitter stream. Some writers lump all of their favorite literary folk together in one list, while others create separate lists for authors, literary agents, publishers, etc.
One of the fun things about these targeted lists is that if you're chosen to be in one, you could find yourself in some very good company. I was looking at Kathy Niece's twitter list of writers, and found myself "sitting next to" some very talented people. It's fun to imagine myself at an intimate dinner party with:
Oh... JK, would you please pass the pepper. I have a phrase that's a little dull and need's some spicing up.
Who are you partying with on twitter's lists?