SharePoint Solutions that are helpful.
ContentPlaceHolders
Every SharePoint page will use a master page which contains ContentPlaceHolders, the master page will determine the location where specific controls will be rendered on the page, but sometimes it is not necessary or desired to render these controls. This solution provides a listing of all ContentPlaceHolders on a page and the ability to selectively hide them.
Here the Quick Launch appears on the Left; the Features Site is configurated to display Tree View.