Your Widget has a "feature" that is not so good - if a Post is sent out in the Feedback mode for review and enough of the people I send the Post to for review the Post will show up on the Top Posts Widget - but the link will be a link that won't work (good in a way since the Post was out for review before being published) -
End result - Google picked up the link and how has it as a crawl error and my visitors had the chance to click on the link and be treated to a 404 Error Page Not Found.
Maybe exclude Posts and Pages that are still in Draft mode from counts and displaying?
Also the views by the reviewers show up in the stats I access from the "Summery" tag but the reviewers views don't show up (after the Post was Published) when I click on the more info graph -
The Post is the most recent one and the 404 has the ID "p=4950"
Blog url: http://captnmike.wordpress.com/