Right now on the front page of ESPN.com, there is a terrific article written by Jerry Crasnick on the art of selectivity and patience at the plate.
I think Jeff Francouer and J.J. Hardy's examples are important to remember before taking the extreme that all players should be looking for walks.
For instance, I certainly subscribe to the concept that baseball players should look to 'avoid outs' instead of 'get hits.' However, I also think you put a bat in these players' hands for a reason - to swing it. I'll take a walk over an out any day (well, unless it's a productive out). That said, sometimes if you try too hard to get these players simply to take pitches so they can draw walks, they'll miss out on the good pitches they should be swinging at.
Anyhow, that aside, it's a great article. It goes in-depth to some of the things that the A's and Red Sox (among others) have done to work on selectivity with their young hitters.