I will be presenting at the November 11th meeting of the Greater New Orleans SharePoint User Group. The topic will be SharePoint Web Parts and Best Practices. The presentation will focus on the 2010 product family and all code will be released after the presentation.
On any web part page in SharePoint, you can append ?contents=1 to your query string to show the Web Part Maintenance page. For example: http://www.yourdomain.com/default.aspx?contents=1
This works in both SharePoint 2007 and SharePoint 2010.