These guys do the best job; I really like the Apple logo, but I'm not completely sold on the headphone jack light. Personally, I use my iPhone's flash as a flashlight without any mods, but this could be particularly useful for a more direct beam when needed.
I'm a huge advocator of making tasteful light mods on cars; side emblems being changed into blinking turn signals, full-width tail lights under plain reflector panels, rear or front emblem / hood ornament being dimly illuminated, etc... I think the glowing Apple mod is by far the most tasteful, well-done mod that there is. Just not sold on the light beam yet. We'll see.
