Noah Broadwater, vice president of information services at Sesame Street Workshop, likes using open-source virtualization tools for several good reasons -- starting with green ones that have nothing to do with Oscar the Grouch.

Broadwater recently faced a budget crunch at the same time he needed new Web servers and was physically running out of room in his data center. His solution: new HP blade servers based on Novell's SUSE Linux Enterprise server software, which builds in Xen's virtualization software. (Xen is the leading open-source alternative to VMware Inc.'s offering.)

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