It was possible already to mass upload documents into Google Docs by way of email, but anyone who has tried that in the past has most likely run into the size limitations (500k, for most documents).
A cursory glance over the API showed me that there are a number of other applications that could be written on the platform, including document synchronization with MS Word or other stand-a-lone Office-style applications, or a Google Docs export utility (certainly in keeping with the principals of data portability!).
[screenshot credits: Google Operating System]