I love innovation, don't ever stop.

That said, any time you use a "free" service or product, it's a good idea to carefully read the Terms of Service first (as with any contract).  Often the service provider has the right to keep any information you provide them, anything you enter into their page or program, any thing you send through their network, along with the perpetual right to use it in any manner they see fit.  The cloud is a great innovation, but anyone concerned with privacy should think twice or maintain your own cloud that you control.

I personally would rather not even receive mail from persons using gmail accounts, and know of several county governments that block email from hotmail, yahoo and the like.