If you have been following the War of the Words between Xen, Microsoft and VMware about how good their solutions are, the blogs are a must read. The topic in question is "memory over-commit" a feature which VMware says helps reduce costs and Microsoft, Citrix (Xen folks) dispute the fact.

The blogs posts start with James O'Neill of Microsoft saying that he will "give... lets say $270 to their choice of charity". Competition, this is how customers like us benefit.