Then there's a question of trust. If I am to store my documents on someone's else computer, how sure could I be that me and others I chose to work with are the only ones which will ever get access to it? I don't see how AbiSource and Google are all that different in that regard. In fact, while I at least understand Google's business model, I'm not too sure I really grok those of AbiSource.
I do understand the increasingly popular trend of "life's short, people's friendly, let's just hop on and not think about anything" progressing with the rise of so-called Web 2.0, but well... imagine a stranger reaching out to you on a street asking if you would like to give all your documents to him so he could store them for you, completely free of charge! What'd your reaction be? Strangely enough, it feels all too different on the web, while I don't really understand what's the difference is.