If I'm not mistaken, Apple trademarked the "lower case letter 'i' in front of a capitalised noun" design ever since they came out with the iPod. There was some hearsay that Apple sued a company for using iSomething* as the name of their product. THAT makes sense because every time you see that kind of name, you think of Apple, or at least I do. That would be a reasonable case of brand name dilution that tueidj mentioned earlier and would be reasonable basis for legal action.
NOW, if Apple were to trademark just the lower case letter 'i'...