I have often found that the 'Recent Projects' section of the Start Page in Visual Studio 2005 (VS) will become cluttered with projects that I am not interested in seeing any longer. One way to get rid of projects from this list is to delete or move the project and then click the project in the 'Recent Projects' list.  VS will say that the project cannot be opened and will ask if you would like to remove the project from the list. Of course, deleting or moving a project will often not be a viable option.  Instead, you can simply manipulate the 'Recent Projects' list manually via the registry.  Navigate to the following registry key:

 HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\8.0\ProjectMRUList

You can manipulate the list by modifying the string values in the ProjectMRUList key.  One word of caution, VS looks for the values to be named in consecutive order (i.e., 'File1', 'File2', 'File3', etc.).  If you create a gap in the order, all 'Recent List' items after the gap will no longer show up.  So, make sure to copy data between values and leave the unwanted items at the end so that they can be safely deleted.