Danny Sullivan replied to his question by linking to a post at Google Webmaster Central that explains the process.
In short, you need to "email appeals at stopbadware.org to request a review" and if they feel you have removed the "threats" from your pages, they will remove the flag. Then, as Danny said, it may take 2 weeks to process that and update in the Google search results.
Is there a way to expedite it for a small business? I honestly don't think so, at this present time.