Ted Rall's good idea

Trim Bush from American History
... Let's begin America's long slog toward moral and political redemption by demanding that our next president's first act be to declare the Bush Administration null and void. Every law and act carried out between 12 noon on January 20, 2001 and January 20, 2009 should just...go...poof. ...
[26 Nov 2007]

I'll add to this:
Give new (presumably Democratic) Attorney General one very specific instruction: bring RICO charges against Republican National Committee.

Voter intimidation, vote suppression, allowing RNC email accounts to be used for official WH business - circumventing Official Records Act, bribery, influence peddling... I'm sure an energetic young organized crime DoJ prosecutor could find plenty more evidence of RNC corruption.

Sure, Republicans would claim it was just a political stunt, but the prosecution's closing statement could be a doozy:
"RNC has used its corrupt influence to undermine our democracy, our Constitution!... more dangerous to America than any Mafia don..." ... etc.

With the expanded Executive powers bequeathed by W to his Democratic successor, this isn't that much of a stretch! (extralegal wiretaps, anyone?)