Facebook — I’ve got a page, and my books have a page.
Linkedin — Social networking for professionals; lots of creative types and garden writers are joining.
RedRoom — Where the writers are.
LibraryThing — Catalog your library and get to know people with similar tastes. LibraryThing hosts author chats, offers an early reviewers program, lists author events in your area, and even lets you explore the libraries of famous dead people.
Shelfari — Like LibraryThing, with discussion boards, Facebook and MySpace apps, and more.
BookTour — A cool site for authors, readers, and venues. Request an author, find out who’s coming to town, get your venue listed.
— Not just for authors, but a great site for tracking performers of
all kinds and requesting that they come to your area. You can also
sign up for notification of events in your community.