My pal Brian Jepson is posting a lot of very interesting and useful info and hacks for the iPhone on Hackszine, like this one:
If you’re a heavy iTunes and iPhoto user, you will probably quickly overflow the limited storage in the iPhone. You could dedicate a day of curatorial work to sifting through your photos and music to pick the ones to put on your phone, but if you want a quick and dirty solution, try creating a Smart Playlist and Smart Album that favor recent music and photos.
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