I was watching my W&G Curse of the Were-Rabbit dvd the other night and it is amazing how well they do it. I mean of course stock frame animation but as well in this film they have used cgi from Dreamworks. In one of the scenes where wallace falls of the top the building as the were-rabbit and then transforms back to his old self. His normal ears have been done with cgi because they were originally the rabbit ears, there is more details on this on the dvd extras.
After watching this I wanted to see the other W&G short films and the one above is a classic with the train scene. Click on the image above for a video preview.