I think the Lee Valley product that is being referred to by Farshot is a product designed for re-gluing chairs, so it’s meant for wood. It’s exactly what came to my mind for a crack repair. Of course if the crack is “gapped” open and there isn’t wood to wood contact then the pinning makes sense.
Here is the MSDS sheet if anyone is interested - I thought it was a CA type glue - apparently not (polymer)
http://www.axminster.co.uk/media/downloads/510450_HealthAndSafetySheet_1.pdf
who knows how well it will work - unless someone here has actually used it..
Also, I like Lee Valley, carry lots of high quality stuff but on the flip side of that they also sell a lot of stuff that solves problems that don't exist
http://www.leevalley.com/en/wood/page.aspx?p=30261&cat=1,110,30261