I was never particularly interested in the whole Holga camera thing, but this Holga-D digital camera project hits almost all the right design notes. It has a simple geometry, minimal interface, and generally looks like something I’d love to cart around. It’s just a concept so far, but it’s a good one; I hope they produce it.
There’s actually an old Kodak TLR in my project drawer waiting to be turned into a digital camera. The project has never ranked very high on my to-do list, but someday I want to pull out the film holder and mount a CCD in its place, with an SD card holder, a microcontroller, and a battery pack hidden somewhere in the volume. I wouldn’t bother with a viewfinder, a flash, autofocus, or any of that: the goal is to create a simple, manual camera that just happens to take digital pictures.