Options for Syncing iPhone App with Desktop Application

What are the options for syncing an iP开发者_运维技巧hone App's data with that of a Desktop application on either Mac OS X or Windows.

So far I have come up with:

1. iTunes plugin (Windows and Mac OS X)
2. iSync (Mac OS X only)
3. The "Cloud"

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You could sync directly via wifi. Bento, for example, allows you to sync from within the Bento iPhone app to the Desktop app over wifi.