Yesterday, I posted about Widget.app, a utility to run OS X widgets on your iPhone. Widgets and the iPhone share a closer relationship than that post suggests. When you create a folder at the root of your tree called /Widgets and populate it, the widgets actually show up in Springboard--the iPhone home screen. When you tap widgets, the iPhone attempts (and fails) to run /System/Library/CoreServices/Dashboard.app. This application does not actually exist or, at least, did not ship with the iPhone. It's clear that Apple designed expandable Widget support for iPhone but cut it out at some stage of the design/delivery process.
Thanks to BloomFilter