[phreanix]

>My conclusion is that to do lean successfully you also need to get off the web and get out and talk with potential customers face to face. Sometimes if you listen carefully they will hand you an even better idea.

Can't repeat this enough. TALK to your (potential) customers. There's just too much to learn from them to ignore this step. Not knocking on the mostly valid assumptions one can make off a/b experiments, but to tweak your product to its best potential, you really should hear and see your customers react, interact, and critique your product.