Yay! Tweetdeck! I love it! The groups feature :s1:
One of the ways to get followers is to follow the people whom you think are interesting. And if they follow you back, you get a new follower. (And don't forget to befriend the 'little guys'- http://socialmediarockstar.com/little-guy .
Another way is to do something interesting outside of twitter. I think that's how @BarackObama got so many followers without doing a thing on twitter :P