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VSphere 5 certainly looks impressive:
Now that VMware is focusing their products on being cloud-compatible, virtual computing is looking more interesting to me. The fact that they're adding security, backup, and data recovery features is an important shift towards treating the platform as a mature component of modern business.
More importantly, can IT afford it. The pricing structure for VSphere 5 is based on a calculation in CPU cores + memory, unlike previous versions. It looks to be quite a bit of a price hike which may hold down the adoption rate