[King James]

.mac is sort of like the old version of mobileme. If you use the Mail application on your macbook (stamp icon) then it should sync regardless so hard to tell if you have all the features of mobileme. If you have it, then definitely set it up (you have to do it on both your macbook and iphone but is sort of hard to type up and explain if you aren't sure how to do it). You would see a cloud icon somewhere that said "mobileme"

If you need/want help I can try to help figure it out on the phone, just shoot me a PM





EDIT: are you sure it is activated on both iphone and macbook? You should get a prompt when it syncs and any pictures you take on your phone would come into iphoto and contacts/calendar stuff would sync as well.