I love hand written letters. It is a lost art that seriously wish someone besides me would revive. Reasons why I like them include:
1) Seeing someone's handwriting really brings across a human element that type face lacks
2) Stationary is pretty
3) It's always nice to find something other than a bank statement in your mail box
4) You don't have to delete them when your inbox is full
5) Whenever you pull them out of an envelop, you can always rekindle the feeling that you had the first time you read it - and it's just as special.