Using WiFi synch, it is not transferring photos taken from my 4S to my Macbook Pro into iPhoto. I tried starting the synch from iTunes and directly on the phone.
Photostream only syncs newly taken photos. If you want to backup old photos just plug in your phone and turn on iPhoto, it will treat your phone like a camera and give you the import dialogue.
Using WiFi synch, it is not transferring photos taken from my 4S to my Macbook Pro into iPhoto. I tried starting the synch from iTunes and directly on the phone.