Here is why you should cover all of your bases cleaning up anything you might have been doing which violated the Google Webmaster Guidelines, before you do that re-inclusion request.
To B.B., the SEO/domainer on Westfield Avenue in Elizabeth, New Jersey: do you really want to be on my radar that much? Maybe not.
You don’t want to get a manual review from Matt Cutts himself! If you have anything to hide, stay under the radar!