I am as well, but I also understand it is a very simple way of branding it and having everyone know, at a glance, that it's an Apple product.

As an example, if you asked an outsider to the tech world which brand makes the EVO, Nexus S, Veer, or iPhone, the only one they'd likely get right is the iPhone. This is a bit of a loaded example because the iPhone is super popular, but then ask a random consumer who makes the follow made up products, the MOVE, Slider, Jump, iThing and they know that the i prefix means Apple and likely wouldn't have a clue who makes the other things.

So anyway, it's a tad annoying, but it is also a dead simple, one-letter way of identifying the source manufacturer. It's quicker and shorter to write "iCloud" than it is "Amazon Cloud Drive" or "Google Music" and identify the source with most consumers. In this way, it's subtly brilliant.