I'm a HUGE fan of hand-written notes. Whenever I get a greeting card, it's more meaningful to me. It contains a person's actual writing and signature. It tells me that someone actually cared enough to take the time and effort to hand craft a personalized message to me.
Handwriting memos, letters, and notes gives them a more human touch. It doesn't look like it's been processed through a machine. By not hiding behind a printer/word processor, this person is being vulnerable by letting you see her/his penmanship. By using pen and paper, it inherently is personal. A person's handwriting reveals her/his style and arguably, their personality (see graphology).
I'm still going to use digital communication (especially since it's becoming more and more of a necessary survival tool), but I am going to consciously put a little more effort every day to handwrite notes to show the people in my life that they are cared about.