Flight control, that way I could pretend that I was actually controlling planes so they could find my ass and rescue me!
This: http://itunes.apple.com/us/app/pocket-heat/id348529925?mt=8 Or possibly this: http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=285281827&mt=8&ign-mpt=uo%3D2 Or maybe just one of the thousand versions of solitaire available on the app store.
I dunno, as good as those two games are, i dont think theyre the ONLY ones... im pretty sure The Quest, RTK and Sword of Fargoal are up there too... Id argue in favor of Myst or Business Tycoon, but i realize thats not everybodys thing..