With the release of the new coolness otherwise known as the Zune 3.0 update a few people have let me know that my Mp3tag sources that hook into Marketplace data no longer work. After a little digging the problem was that the Zune team put everything into a namespace thus breaking all the tags I was searching on. A little search and replace magic and now we have an updated Marketplace.zip.
As an aside I was at the EMP, the Experience Music Project in Seattle which is like a huge museum/learning center centered around all things music and I discovered that the Zune team is actually one of the sponsors. Very cool