To add to Tony's: http://startuplessonslearned.blogspot.com/2008/11/using-adwords-to-assess-demand-for-your.html http://startuplessonslearned.blogspot.com/2008/

To add to Tony's: http://startuplessonslearned.blogspot.com/2008/11/using-adwords-to-assess-demand-for-your.html http://startuplessonslearned.blogspot.com/2008/11/using-adwo...