I started out with the marlin hitch, but encountered the problems Frank noted. I switched to a plain spiral lacing for the boom and gaff, and am quite happy with it. I've notice that's the way many Friendship Sloops lace the sail to the spars.
I also lace the sail to the mast, using a back-and-forth method. When we were in Key West we sailed on a 60' schooner that had attached its sails to the mast and the spars in exactly that same way.
(There's a photo that illustrates this in my gallery, but I can't seem to make it show up in this post.)