Jeff Key has updated NetPing.  NetPing is one of the primary examples I use when teaching newbies C#.  It's a nice utility that everyone can easily understand.  It's full of nice examples of Threading, WinForms, etc. 

It's also a cool addition to utils collections for the IT wonk.  He's updated it to include launching Remote Desktop, launch Computer Management and NetworkDriveInfo (another nice util).