I've heard many people complain that the plot for "Lost" has seemed to wander off lately. Apparently, it has found its way to the iTunes Store.
Apple has released a "Lost" game for iPod [iTunes link]. It features a storyline by the show's writers, familiar settings (like Black Rock and the hatch) and several "quests" to complete, like assisting the wounded at the crash site for hunting for useful goods. Sounds like fun.
The Lost game requires a 5th generation iPod with Software version 1.2 or later, and costs about five bucks (US).