BTW, 4season, are those HP boxes on the left some of the Itanium ones? Like the rx2660 or whatever. What sort of applications run on those? (And which OS do you use?)

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Nah, those are DL380G5s equipped with dual Xeon processors and they're running Windows. To the right of the Xserves and out of the photo are the newest HPs we got, which are the DL380G6es, but they're up to G7 now. They mostly serve up 4D databases. But we've been moving away from standalone servers, partly because heat and power consumption are ongoing problems. So newer projects are virtualized in VMware Vsphere, and you might say that Linux is the foundation upon which everything is built. I understand that OS X can also run under Vsphere, but I doubt that it's sanctioned by Apple. Wish they would, because I'd sooner migrate to Windows than haul Mac Pros into the server room.