This Seattle Times article ("Councilman wants his e-mail to be open book") is something politicians, public figures, and just about anyone should keep in mind when drafting emails.   Assume if it's interesting and relevant enough someone will gain access to it.  Councilman Randy Corman has taken it one step further, and ensured that all of his emails are available for public viewing.  Apart from transparency, increased civility is another potential byproduct of this move - or so says Councilman Randy Corman.  [I get the impression his emails are being printed and made available in paper.  I hope that's not the case.]

You might recall, this is related to the reason why GW doesn't use email so much [Think Progress]:

H.W. BUSH: Not anymore. Because now I use the email. And the computer. And I find that I don’t do near as much writing as I used to, letters as I used to. I don’t save them. And I am worried about that a little bit not that I have that much more to say, but I think it’s too bad in a way that email will detract from the historical record of presidents. I don’t think that the President Bush uses email.

BARBARA BUSH: He doesn’t.

H.W. BUSH: You worry about it. People are going to subpoena the email records and we are going to, you know, you’ve gotta prove that you were telling the truth and all this stuff. I mean, it’s gotten so adversarial that it’s ugly.

Obviously that's comparing apples to oranges. 

I think Councilman Corman's move shows the increasing possibilities for transparency through media such as email.  I don't think - due to privilege/privacy/confidentiality reasons - you could have a situation where Corman creates a "public alias" where people can just sign on to view or receive his emails.  But it doesn't take much for Corman's staff to upload approved emails to a location where they can be accessed, searched, and viewed publicly.  Voila.  Instant transparency.