On the mac, the equivalent of I.E. is Safari. There are plenty of other browsers available for the mac, but for many people safari can get the job done.( this does not go for safari 3 which is still in beta, it tends to crash allot ) If you feel safari is wimpy I recommend using camino. It is not as pretty, but in my opinion, it is better then firefox for the mac( it is actually only for the mac and mozilla, A.K.A the maker of firefox, created this browser which is completely cocoa)