I use a simplified version of Valiente's preventer. I attach a snatch block forward of the mast on either side of the boat. I'll use my spare jib sheets, if I have nothing else, and tie one end to the boom, lead it through the snatch blocks, and then lead them aft to my two aft winches. That setup, and a whisker pole, makes for a pretty easy run sailing wing on wing.
The double headsail idea isn't too bad, either, if you have an extra halyard up front (you should have a spare, anyway). I just don't like unfurling the extra sail, only to have to stuff it back in the bag later.