The "Paperless Office" is still a long way off. We all know that. So until it gets here, we need to know exactly how our printers are being used.
PrintManager is non-intrusive and works will all versions of Windows since NT 4.0 (So that's Windows NT 4.0, 2000, XP, Server 2003 and Server 2008), and tracks printer usage on a per-user basis.