Much like Words With Friends on iPhone and iPad is a cheaper, better implementation of the official Scrabble app, there are no-name Risk knockoffs that outclass the official app.
TouchArcade points out four in particular, Lux DLX2 ($5), Generals ($3), Strategery ($2), and Dominion ($2). Strategery sounds like the most bang for the buck: For $2, it's a universal app (for iPad and iPhone), and it offers single and multiplayer with the push notifications that Mark so hotly desires in the official Risk app, so you can slowly kill a day, one move at a time. But if you've got a favorite, tell us why. [TouchArcade]