I'd like to start a new forum where people can talk about what's working for you right now in marketing your book.
I think this will help other authors to prioritize their activities if they can find out what's working for other people. This would be especially valuable to new authors.
I've share the hottest tool that I'm using right now. And that's Twitter. As you will note on the main page of this Book Marketing Network website, both my http://www.bookmarket.com
website and this network have been rising in Alexa ranks (and visits) because of my use of Twitter.