Create a series of online services. Perhaps under a domain such as ubuntu.net or linux.net.
When people install Ubuntu, their e-mail client such as Evolution, Thunderbird, KMail and IM clients such Pidgin comes with presets.
So they can login to MSN from Pidgin via address like user@ubuntu.net.
They can also use it to login on Jabber/XMPP.
It also works like an OpenID, so you can use it to login on Brainstorm, Launchpad, and perhaps some bugzillas and perhaps SourceForge.net and Freshmeat.net.
Basically setup an Jabber/XMPP gateway, a e-mail server, and an OpenID provider, so that every Ubuntu/Linux can get a user@ubuntu.net address that he can use to access mail, login to websites and chat on MSN and Jabber/XMPP.
