He can't do any more, so here is Wikipedia's list of the people George W. Bush has pardoned, or whose sentences he has commuted.
Perhaps the smart thing to have done would have been to charge the entire American financial establishment and pardon them. *
Still, if he listens to the Village Voice, President Obama now has the chance to pardon Bush and Cheney.
* Perhaps unnecessary. The VV article quoted above says an 1866 Supreme Court ruling means you don't even have to be charged to be pardoned.