I use a program called Buzzom to help generate more followers. I maganged to get over 500 followers in less than 12 hours.
OK it sound like one of them sales pitches but its not. I found its good to use just to get some followers at the start. now i find new people following me everyday.
You then want to look at getting more targeted followers in the area of your business / hobby. Search for people using keywords rather than names. Its amazing what we have found
I run a few sites and found twitter really does help generate traffic to my sites, Since using it most links come from twitter in some shape and form. My wordpress blogs also auto publish to twitter and twitter sends me around 80 visitors everytime I post a new article.
I've also noticed bots picking up my tweets and posting on other sites around the web for me, even more so if i post a voucher code.. And all this for..... £0 Whats over-hyped about that?