Wanted: Elegant File Transfer from Mac to iPhone

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I frequently find that I have a photo or document on my Mac that I need to get to my iPhone and the easiest solution seems to be to just email it to myself. Every time I send such an email, I think to myself that there has to be a more elegant method. Ideally, I'd love something that lives in my dock that I'd be able to just drag files into and then they'd immediately appear on my iPhone.

What's the most seamless way for getting a file from my Mac to my iPhone?