The arcade game of semantris was really annoying because as soon as you got a word wrong the new words started to pile up making finding the original keywords difficult.
The tetris game was more pleasing and a funny thing happened to me as I tried to destroy the block "internet" with a word "google" and the second last block eliminated was "monopoly", hah. Mildly amusing.
But I'm curious to see what kind of applications can/will be made out of this.