In past discussions about the virtues of dowels verses biscuits I have praised the Stanley #59 Doweling Jig for allignment when edge joining boards. Since this is no longer manufactured (mine is about 100 years old), I am sure that not many will recognise it or be aware of its strengths. I was using it today in my current project (a chest of drawers for my son), and managed to take a few pics for your interest.
This is a very easy-to-use doweling jig. It is supremely accurate. It is also very quick to set up and use. I estimated that it took about 15-20 seconds per hole.
Of course, it is "horses for courses". I own and use a biscuit cutter as well, but for alligning the edges of boards I prefer to use dowels. I just find them that tad more accurate.
The downside of dowelling is that they must be accurately drilled or else they will not fit. This jig is different, is easy to use, and will change your views about dowels.
While the #59 is only available now on eBay (they do come up every now and then), it is possible to buy a reasonable copy of it at Bunnings (and cheaply).
The pictures
(1) In the first picture the two boards are clamped back-to-back and a line is drawn across the two boards.
(2) In the second picture the jig is lined up on its inside.
(3) Drop in the chosen size drill guide (there are 9 to choose from), clamp it down, then drill out. Reverse the set up and drill the other board (as a mirror image).
(4) The fourth picture is an enlargement so that the markings can be seen.
Regards from Perth
Derek