One of the irritations of the world of virtualisation is that it's quite easy to end up with a relatively small number of physical devices hosting address counts that run ahead of Ethernet's constraints on things like how many MAC addresses can exist in a LAN (or VLAN). It's one of the constraints that lies behind the rise of …
Brilliant move by HP, Cisco and more recently Sun
The shift to blade servers integrating switching with servers is a brilliant move by HP, Cisco and more recently Sun (would give IBM some credit too, but they dropped the ball on x86 blades). For scale-out servers. the move to integrated networking infrastructure is brilliant.
Brocade's story is good too, but it stands some what removed from the server and has to rely on the kindness of strangers to be integrated.