Not sure what happened to my post, or was it in the other thread? I have two forks, same manufacturer, one touring, one touring/cross with both mounts. The Disc fork is 9 ounces heavier. BB7 calipers are real heavy, plus you need a rotor, and you need a special wheel the spoke rigging angles of which are generally worse, or the rear hub is oddball and heavier.

One thing that might be nicer about a disc would be if the load didn't interfere with it. I normally find some point on tour when the load is in the way of my brake cables, not a big deal, but one more thing about touring bikes that is a bit of a kludge.