Even in today's high-tech, instant-results culture, there is still nothing like receiving a hand-written note. No matter what your thoughts are regarding proper etiquette, it is always proper to send someone a note of appreciation. Pre-written thank-you notes and emailed thank-yous just don't cut it. Something is to be said for taking time out to write a personal message, address the envelope and buy a stamp and, then, dropping the note in the mail.
Not only do written notes make a bigger impression, but they also make a longer-lasting impression. How many times do you save a handwritten note as compared to keeping an email of the same nature? Hard copies of letters from parents, grandparents and inspiring people are much easier to pass along to the next generation. Michele, who's father passed away suddenly when she was 20, would have hardly any remembrance of his writing if it weren't for the letters he wrote to her. Emails just don't carry the same sentiment...nor are they as pretty. :)