It's good that train operators are starting to offer free wifi, especially since the new rolling stock I've travelled on recently seems to have RF screening on the windows, which prevents my 3G HSDPA phone (a Nokia E71) from connecting.
I used to think it was T-mobile's fault until I made my regular journey on an older train and got 100% signal for the entire trip! Of course the older trains don't have power sockets so it's currently a lottery as to whether you get power but no network or vice versa!
You might be interested in claimid.com - an online identity management service. It helps you to collate and contextualise online information about yourself. I reviewed the site a couple of years ago (http://www.richardskingdom.net/be-yourself-online) and I still use it to collect all my various online profiles together. It doesn't do all that you ask, but it does help with managing the "massive digital wasteland of previous identities"!