So don't think mass market. I was approached to build a product. Part of that product is some hardware I can either buy off the shelf and design around, or I can design my own to do exactly what I need for this project and for future projects. I've been seriously thinking about open sourcing the design since it's just one module in the entire product and I know others would find it useful.
If anyone here has similar ideas, let me know. It would be great to start a SourceForge like site for hardware.