This is pretty amazing and cool. I've created two 100 person lists using TweepML. It only lets me add 100 people at a time (I have a list of hundreds through the OWC network of wine businesses) but this gives you an idea of just how easy this really is.http://tweepml.org/Wine/
http://tweepml.org/Wine2/ Try it if you want a jump start on wine folks! VERY very cool.