TweepML
Want to make a list of twitter users that have some stuff in common? Maybe you work for a church and want your congregation to see who tweets inside the church? Here is the resource for you. Check out tweepml. TweepML is an extensible, open standard format that allows you to manage and share groups of Twitter users. You can add TweepML to your website to make it easy for people to follow everyone on it with a single click.

Check it out here and share your list with the world.