Lately, a slew of jailbreak tweaks have hit the Cydia store, and PageLock is one the more interesting ones in that bunch. PageLock is just that, interesting, but not necessarily useful, or even desirable for that matter.
The basic premise of PageLock is to lock your iPhone's Home screen to just one page. In essence, that means no swiping from page to page, whatsoever.
That can be kind of cool, especially mixed with other jailbreak tweaks like SpringJumps, but it certainly takes some of the "iPhone" out of the iPhone, if you know what I mean.
Page swiping is one of the iPhone's most essential features; it's on an iconic level. Getting rid of such a feature takes some of the fun out of using the iPhone, as you'll notice in this First Look video...