Here's a short preso on marketing a startup. It's from my former colleague at Yahoo, Sean O'Malley. My favorite point in the preso is "The product *is* the marketing." This is especially true on the internet. Every website in the world is one click away from your desktop, so distribution is free. If the product adds enough value to users it will market itself -- great examples are Facebook, LinkedIn and Google.
Sean's blog is chock-a-block full of insightful product and marketing advice for internet services. Click here to check it out.