When was the last time you got a letter? A real letter? People nowadays aren't used to receiving longer letters; Sometimes, when I get a thick handwritten envelope (in a hand I don't recognise)I assume it's some amateurish press release! Typed letters are acceptable for informal letters to close friends, especially if your handwritng is difficult to read or if you have a great deal to say, typing can be clearer. However, thank-you notes should always be handwritten. By all means avoid using a type face that looks like 'manuscript', those horrid swirly "affected" fonts. I simply prefer handwriting, blotches and all. It's simply more personal.