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ZDNet Asia recently interviewed Oliver Bell, Microsoft Asia-Pacific's regional technology officer. The story mentions Oliver's blog post. I can attest that I've had several conversations recently where customer's problems were solved by custom XML parts that are bound to content controls.
In addition, Ian Blackley, sales engineer at TX Text Control, comments on the momentum of Open XML: "We expect a very high demand on the new OOXML format...We are already getting loads of requests regarding this format."