A few I would like to see: Captain Blood, Adam's Rib, Babes In Arms, Babes On Broadway, The Andy Hardy series, Random Harvest, Captains Courageous, maybe a few more Warner Gangster titles, Red Skelton, the rest of The Marx Brothers.
I will add to the list of great titles already mentioned by others: Any Red Skelton titles including the Whistling In The Dark trilogy and the Andy Hardy films. Not sure if these were mentioned earlier in the thread.