I do love me a repair project every once in a while. Quick and easy. Get somebody's bike back on the road.
Fixed the rear DO on an old Condor road bike frame today. Cut the Campy dropout above where he damage was and welded on half of a new old stock one. A little debatable whether this is preferable to replacing the entire dropout. Pluses and minuses to both ways. With only welding on part of the dropout, you are reducing the amount of heat going into the stays significantly (they only got lukewarm). But you are creating a week point on the dropout where the weld is. Just a question of where you want it to break next time IMO.
Went with the weld method for this one, quick and dirty style. It's a much quicker fix and saved the customer a couple of bucks. Whatever the case, the bike is up and running and the customer has his trusty steed back. And that's the important part.