CT-15 Multi Square from Bridge City Tool Works
The CT-15 is the latest gadget form Bridge City Tool Works. It is a small pocket square, that has an 8:1 dovetail saddle square, a 6:1 dovetail saddle square, a regular saddle square and a cam lock sliding t-bevel which can be quickly set as a try-square or a double square, and the whole thing is milled out of solid stainless steel.
If you do a lot of work with hand tools and layout your dove tails by hand, the CT-15 might be what you need. BCTW says it is "extremely precise, accurate, and the joints tight-fitting" and at a price of $289.00 it better be. The CT-15 is in production and scheduled to be available February 2009.