If you missed this, it is finally possible to publish your data on Windows Azure Marketplace. The name DataMarket is no longer present here also because the marketplace also include applications and not only data, but the news introduced by the last service update is that you can finally publish your data without having to run into a manual process with Microsoft.
I think this is a very good opportunity for all these companies that produced data sets for their own internal use but that can be interesting to a wider audience, even just for technical reasons like normalization and cleansing domain specific data. I’d like to investigate on TCO for publishing data “for free” – if someone already did the math, I’d like to get feedback!