Many times I have needed to get a copy of the dll that is in the GAC for a webpart. I have been trying the different methods to get to the dll without the possibility of moving the reference to the GAC entirely (which you can do with the xcopy command! :-/ ) Here is a method I like: To view the physical file structure of the GAC, add a DWORD value named ‘DisableCacheViewer' to the registry key HKLM\Software\Microsoft\Fusion and set it to a non-zero value. Works like a charm!

Changing the web part menus in SharePoint could be really valuable,especially in branding your site.How to create web part menus in SharePoint

Found this SDK article on how to “Customize the Shortcut Menu for List Items“