A recent thread on this topic brought up the question as to whether fork steerer threads are cut or rolled. It got me wondering, so I contacted my local Columbus dealer (framebuildersupply.com) they contacted Columbus, and the answer:

They are cut. At least that's the way Columbus does it.

I've purchased steerers from Nova Cycles before, who contract to have their own made. They appear to be cut as well.

Others may roll theirs, but I've looked at a few 1" threaded steerers in my life, Ishiwata, Reynolds, True Temper all appear to have been cut. I say that because the ridges of the threads are sharp. I have a hard time trying to figure out how a rolled thread would have a sharp edge, but perhaps someone will pose some pix or links to convince me.

BTW, here's a video I found of an axial thread rolling machine in action. Pretty cool.