This book must have written for me because it chimes so much with my experience on Twitter. The writer, Rayne Hall, has about sixty thousand followers on Twitter. Really, to sum up her message in two words-be authentic. She describes the techniques that work best for her on Twitter, the pitfalls to avoid, and the mistakes she has made. She has tried out a lot of strategies/applications, which will save you a lot of bother and frustration if you listen to her. Her focus is on gaining real followers. She encourages conversation instead of automated spamming. I learned a few useful tidbits like about bookshow.me and booklinker. If you are new to twitter, this book is essential reading.
By the way, if you are interested in following her, her twitter account is @RayneHall.