Listmania!
Best books on SEO, SEM, PPC, Adwords
By an Amazon.com customer
Search Engine Optimization: An Hour a DaySearch Engine Optimization: An Hour a Day by Jennifer Grappone
Buy used from: $2.79
Good book on SEO
Search Engine Optimization For Dummies, Second Edition (For Dummies (Computer/Tech))Search Engine Optimization For Dummies, Second Edition (For Dummies (Computer/Tech)) by Peter Kent
Buy used from: $3.00
The best book I have read on SEO
Search Engine Marketing, Inc.: Driving Search Traffic to Your Company's Web SiteSearch Engine Marketing, Inc.: Driving Search Traffic to Your Company's Web Site by Mike Moran
Buy new: $37.11 / Used from: $4.67
The best book on Search Engine Marketing covers SEO and SEM very well.
Search Analytics: A Guide to Analyzing and Optimizing Website Search EnginesSearch Analytics: A Guide to Analyzing and Optimizing Website Search Engines by Hurol Inan
Buy new: $19.99 / Used from: $15.99
Good book on SEO, among first few to hit the market.
Google Advertising Tools: Cashing in with Adsense, Adwords, and the Google APIsGoogle Advertising Tools: Cashing in with Adsense, Adwords, and the Google APIs by Harold Davis
Buy new: $19.79 / Used from: $1.56
Very good explanation to adsense and gives you ideas for how to make money form GOOGLE $$$$
Pay-Per-Click Search Engine Marketing Handbook: Low Cost Strategies for Attracting New Customers Using Google, MSN, Yahoo & Other Search EnginesPay-Per-Click Search Engine Marketing Handbook: Low Cost Strategies for Attracting New Customers Using Google, MSN, Yahoo & Other Search Engines by Eugene Mordkovich, Boris Mordkovich
Buy new: $20.65 / Used from: $14.83
Clearly the best book for PPC.
Winning Results with Google AdWordsWinning Results with Google AdWords by Andrew Goodman
Buy used from: $3.99
Good book on Adwords, the explanations for ROI calculations is very good
Search Engine Advertising: Buying Your Way to the Top to Increase SalesSearch Engine Advertising: Buying Your Way to the Top to Increase Sales by Catherine Seda
Buy new: $24.26 / Used from: $0.24
Among my favorite books on SEO and SEM