True to their tradition on the Mac, the Calendar and Addressbook applications on the iPhone are, let’s say “lacking finesse”. As good as Apple can design products and user interfaces, their focus is clearly not on calendars and address books. I’ve read somewhere that “iCal is proof that Steve does not maintain his own calendar”.
After trying out various replacements on the iPhone, I finally stuck with a pretty darn good calendar for the iPhone called “Week Calendar”. The main reason for switching to that app is that it actually has a week view, but when I started using it more intensely I found myself using the month view the most. Until somebody at Apple stopped the show.