What do you get when water and marbles are combined into a column-based puzzle? Switchaball by Drippy Cat Software Limited. The game for some reason reminds me of Plinko from "The Price is Right".
iPhone and iPad apps tagged "Plinko."
Peggle is Peg Popping Pandemonium
Peggle - It has to be said that I really enjoy Pop Cap games. Most are easy enough to play, complete enough to be a fair amount of lasting fun, and while I may scoff at the price to add them to my iPod touch, I usually find them to be worthy enough.