Traditionally when a President leaves office, he'll issue pardons or commute sentences of convicted criminals.
Any speculation on who Bush will pardon? Keep in mind, he can grant a pardon for anyone who hasn't been accused of a crime, preventing them from ever being prosecuted. Ford did this for Nixon.
Some background:
10 Most Notorious Presidential Pardons
http://www.time.com/time/2007/presid...ons/index.html
List of people pardoned by Bill Clinton
http://en.wikipedia.org/wiki/List_of...y_Bill_Clinton
List of people already pardoned by George W. Bush
http://en.wikipedia.org/wiki/List_of...George_W._Bush