New York and Minnesota just completed studies into the merits of using open formats.
In the Minnesota report, the Office of Enterprise Technology came out in favor of open document formats, but stated that the marketplace is in flux, and it may be too early to recommend one format over another. (In related news, Microsoft just announced that it will support the Open Document Format in its next Office 2007 update.)
The New York report was a bit confusing, advising that NY should not adopt any one format due to the risk of it becoming outdated. This is confusing, because open, standardized formats do not become outdated. That is the whole point of ISO standardization.