DropDAV is a $5 per month service that allows you to access your Dropbox account through the WebDAV standard that Apple uses in iWork for iPad applications; other applications can also take advantage of this connection method. WebDAV is similar to MobileMe’s iDisk, and will work with many different iOS and Mac applications. And this particular app can help you easily access your Dropbox files in iWork so that you can edit documents on the go from your iPhone or iPad.
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How to Access Your Dropbox Account in iWork for iOS | Mac|Life.