Microsoft should give the SysInternals guys a raise! Jon Schwartz and Mark Russinovich (SysInternals) have created a nice little tool to recreate the "runas..." shell context menu key in Vistas registry.  The lack of this function (when using appropriate security settings) has been one of my daily points of frustration when performing sysadmin tasks from a Vista workstation.  Thanks again Sysinternals (and Microsoft by proxy) for feeling our pain and giving us great, FREE, tools to get the job done!

ShellRunas v1.01:

http://technet.microsoft.com/en-us/sysinternals/cc300361.aspx