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Here is an interesting opportunity if you are a developer working on a product that interacts with SharePoint. There is a free interoperability plugfest in Redmond on June 15th and 16th. You can test your SharePoint interoperability, and get answers directly from the SharePoint team. There will be presentations as well as opportunities to set up 1-to-1 meetings. This event will cover the file operations protocols that support file access, synchronization, and collaboration scenarios.
The event is free, but registration is necessary. Doug Mahugh has the details.