There are so many author websites out there, it's almost frightening!
Of course, the best scenario is to have your own domain name. And if you're really serious, you will!
But there's other options, most of which are free. And the more sites, the more exposure, the better!
The Author's Den offers free and paid website services.
Book Tour is a great site - lots of big name authors listed there as well.
There's Book Marketing Network and Book Place.
Also out there for authors & readers alike is Shelfari.
And in this day and age, everyone should have a blog, too!
So no excuses - get yourself out there on the web!