One of the biggest selling points of the iPhone is the sweet multitouch screen that lets you use your fingers to do any number of things. So it seems kind of odd to me that anyone would want a stylus for their iPhone. After all, styluses are what was used on older, crappier touchscreens. Doesn't this seem like a step back?
In any case, this thing replicates the feeling of a finger, so unlike other styluses, it'll work on the iPhone. It also has a felt tip, so it won't leave oily smudges all over your precious little device. But really, come on. Just use the thing as it was intended to and don't bring it back to the late 1990's, OK?