I love the way that polaroids, at least in their original unscanned forms, have a physical presence in the way that digital photographs or even film images do not. When you are holding a polaroid photograph, that object attests to the fact at some point it was close to the person it shows, physically there where it depicts. To me they have a feeling of honesty or verity about them, and a stronger (though still tenuous) link to what they show.