URL itself, meta description (156 characters max), and title tag (65 characters max) make up your "free google ad." Here is a nice article on the two important tags and another article on Meta tags in general.
David Meerman Scott
A great overview of grassroots marketing, recently updated. Highly recommended if you are just getting started with marketing.
Always Be Testing: The Complete Guide to Google Website Optimizer
Bryan Eisenberg, John Quarto-vonTivadar
A must-have if you want to do split-testing. Lots of great concrete ideas, plus some good marketing gems.
Duct Tape Marketing: The World's Most Practical Small Business Marketing Guide
John Jantsch
Great general book - probably the first marketing book I read.
Search Engine Optimization: An Hour a Day
Jennifer Grappone, Gradiva Couzin
Good overview of SEO, with suggestions for small steps you can implement over time.
Purple Cow: Transform Your Business by Being Remarkable
Seth Godin
You need a product that stands out in the crowd. Seth Godin's books are all useful and entertaining.
eBoot Camp: Proven Internet Marketing Techniques to Grow Your Business
Corey Perlman
Another good beginner, overview book about marketing on the Internet
Permission Marketing : Turning Strangers Into Friends And Friends Into Customers
Seth Godin
This is really useful for understanding why you need a list!
Trust Agents: Using the Web to Build Influence, Improve Reputation, and Earn Trust
Chris Brogan, Julien Smith
URL itself, meta description (156 characters max), and title tag (65 characters max) make up your "free google ad." Here is a nice article on the two important tags and another article on Meta tags in general.