Dave Draper's website hosts a useful, video-filled book on basic kettlebell training. If you're new to kettlebells, this is a useful place to start. If you're wondering what kettlebells are like and how people train with them, this is an even better place to start.
And it's free, free, free.
Kettlebell "Smart Start"
Warning - that link is to a pdf, and the pdf contains links to .mpg files on the author's website. You'll need a PDF reader and the ability to watch and listen to videos to get the full benefits from this book.