I just installed W3 total cache and configured it after a guide I found. I must say the results are great: I currently get a 85 score from Yslow (previously had 75 or so), but apparently there are still thigns that need to be optimized.
I get a "Grade F on Add Expires headers" from the Yslow Chrome extension, although I set up the Browser Cache Settings correctly (at least I think I did..). Here is a screenshot of the rowser Cache Settings I am currently using: http://i55.tinypic.com/16bd9jm.jpg
Am I doing something wrong?