I was confused at first with the new sync features of iOS 5, iCloud and iTunes wireless.
But a quick “wah?” later and I realized you have two sync options and you really only need one at a time. If you have no computer then iCloud is the only way to backup and sync files. But if you do have a computer with iTunes then you already have a way to sync to it and then back to your other devices. With the new wireless sync feature in iTunes your devices sync automatically and pretty much eliminates the need to use iCloud at all unless you absolutely must have everything synced at all times no matter the data cost or privacy risks. Remember, your information is not necessarily private once it crosses through the open internet.
Let me know what you think.