We use a command similar to this on our Tellabs gear (when the optics support it that is). It's a really nice feature. Glad to know there's a Cisco analog. What's really cool, is there's some optics ...

Cisco Catalyst 3750....when I do the "show arp" command, it tells me what vlan the macs are in. I don't care what vlan the mac is in, I need to know the physical port (fa1/0/3 for example).