All this "merged SAN and LAN" just sounds like a very expensive version of iSCSI, which doesn't seem to have taken over the market like the vendors were screaming it would. I like having LAN and SAN separate, and we have some SAN bottlenecks where we're gagging for 8Gb - I'd not want to have to lump those bottlenecks onto a "merged Ethernet" where it will have to compete with LAN traffic for bandwidth. I can't help thinking this merged mumbo-jumbo is just CISCO trying to beat out Brocade by turning the SAN discussion into a LAN one.
In the meantime - go Brocade! If they can make network switches as well as they make SAN ones I'll be taking a look at them.