iPhone keyboard (or the lack thereof) has been a polarizing point for many, and while we've seen a workaround or two in our day, we've yet to see a solution to the lack of tactility as beautifully simple as this. 4iThumbs is a screen overlay that adds minuscule bumps on your iPhone display -- bumps that correspond to where the keys are when using the vertical keyboard. 'Course, these things are apt to bug you when using the horizontal keyboard (or no keyboard at all), but we're guessing the heavy texters in the crowd won't mind. Have a look at the videos below the break for a better idea of what you're about to get yourself into. Oh, and be sure to pick up a pair of Awethumbs while you're at it -- we hear these two go great together.
Update: A horizontal version is available, hooray!