Visual Studio 2010 web parts and the type could not be found or it is not registered as safe

Not the story I'll ready to my daughter tonight, but the tale of a rename gone bad. When you're creating a web part in SharePoint 2010, and you rename your items from VisualWebPart1 to MyCoolWebPart, perform a Search in the Entire Solution scope for any remaining remnants of VisualWebPart1. There were a few...fix them up and your web part will register safely just fine & you'll be able to add it to your web part page.