Striplox has and interesting product out that is fairly similar to the Z-Clip product that we use alot of around our shop. It slides horizontally (or vertically), allows the connectors to be very flatly nestled together, though this is true if you inset Z-Clip as well. It is a little different in that there is an option that makes it lock into place, so that it will not be removable once installed.
The website shows additional uses, including being able to put it into the end grain of a piece of wood, and to use it for corners. It is definitely something that I could see being used in the shop.