Well, the Pre keyboard hack is scary no more, and actually available as an app now, thanks to WebOS Internals. Full guide at [PreCentral]

According to the patent application, simple input commands like delete and space would be controlled with simple back and forward-swipe motions. While remapping something that is already readily available through a screen key is of minor value, this technique could also be used to introduce completely new functions, and augment the iPhone's somewhat gimped text manipulation.

To this end, the patent describes customizable functions, which could lead to multitouch gestures that trigger the deletion of entire words, switching of keyboards, or quick input of specific characters. While many users would never take to a gesture system like this, it wouldn't get in anyone's way and could be silently slotted into the next firmware update without much effort or controversy, providing a nice little feature-add for iPhone and iPod Touch users. [MacRumors]