There was a major new update for Miva Merchant 5.5 released today. Details are here.
I created two tutorials, open to the public, about the update:
Susan Petracco of NetBlazon, Miva Merchant module developers and consultants, interviewed me in San Diego a few months ago during the Miva Merchant User Conference. They posted the video of the interview at their DoublePlus blog:
Please ignore the way I don't know what to do with my hands, a la Ricky Bobby in Talladega Nights...