Remember the PalmPilot? Remember how it synced all your contacts to either Palm Desktop or Outlook? That was pretty nice.
If you're a Windows user, there's no such desktop option for managing your iPhone address book. Sure, it gets backed up when you sync with iTunes, but there's no way to view or edit all those contacts. Your only real option is to switch to syncing with iCloud, which affords limited browser-based contact management.