> 4. Interplanetary transportation of a massive payload. Project Orion, > anyone?
Don't forget a more realistic scenario: an asteroid on a collision course. Another use can be quick construction of large underground storage tanks for gas or oil. Or extracting the rest of oil from almost empty oil bed. The heat and pressure wave will crush the porous rock, forcing the oil out. (I am not sure if I quote it right, WAY too many years ago I read it in some popular-science book.) Or large-scale planetary construction works. (The meek shall inherit the Earth - the others aim for the stars.) Or pumping of one-shot gamma lasers. (What you want to use them for is on you, though.) MANY more uses.
