There was a video in progress with a recent version of Ubercart at http://blip.tv/file/612890. Someone posted a contrib showing how to setup a t-shirt sales store, but it was an older version of UC. The development team doesn't have a whole lot of time to work on things like this, mainly because the core code/forum support and bug tracking takes up a lot of our time but also because there will never be a holy grail of tutorials that satisfies everyone's needs. Anyone is welcome to add tutorial pages, though. Hopefully we can do more in the future!