Smashwords and similar digital book selling sites are places to make sales if your writing is up to the job. You know what's selling, how much has sold, and can get direct deposit, which is cool.
Many writers are running into it like a new gold rush. For each one who sells ten thousand copies, there are 10,000 unknowns who don't sell anything.
http://jakonrath.blogspot.com/2011/01/guest-post-by-lee-goldberg.html
But make sure your words are worth reading or your fan base will let you know right away--and they don't pull punches. Getting feedback from other writers (which you can do right here on AW) is a step in the right direction. That way you get rid of weaknesses in your work before releasing it into the wild.
Don't ask readers to just trust you and buy what you've got up based on a title and a description. Post a sample to get readers interested, and then if they like it enough to buy the rest, it's payday.
Make sure your work doesn't suck or you can get the wrong kind of "buzz."
http://terribleminds.com/ramble/2011/02/02/why-your-self-published-book-sucks-a-bag-of-dicks/
Technically it gets your work "out there." But commercial editors, agents, and publishers won't be trolling the site looking for the next S. King. They're busy dealing with submissions that came in via the usual channels.
I groan when I see the term "create a buzz." I want to hunt down its inventor--probably a fee charging agent or a vanity house--and introduce their craniums to my pet brick. When I hear the term I know I'm dealing with a shiny-eyed neo and so does every other writer who's been in the trenches for more than a year.
I've been at this since the late 80's and have yet to create a buzz with any of my books. They did bring a tidy advance check, which made up for things.
Identify where and what you think a buzz is. If there is a place on the Net where buzz happens, let the rest of us know. I'd love to have one of my very own!
I rather suspect a buzz (media attention, going viral on the Net, getting arrested for being naked at NASA) happens should a book be noticed by the great goddess Oprah or gets mentioned by some other Famous Person. (JFK did wonders for Ian Fleming's sales.) Other than that, it's a Chimera.
But if you want to sell stories and make money--a perfectly honorable and achievable goal--then leap in with both feet and write, write, write. If you should get a buzz, great, but don't expect or seek it. Just be a writer. Let your words do their magic for you.