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Published on Jan 5, 2013
Here's a video of the user experience in SPInvoice. Note that this is from the development version, so there may be some changes to the final version.
I'll be opening up for pre-orders of the SPInvoice Explained issue next week. Pre-order customers will receive the development version of SPInvoice right now (CodePlex release version to be available within a week or so), as well as the draft copies of the issue and an extended 30-minute video that shows far more aspects of the solution than this teaser.