I write cards and thank you notes all the time. I write at least a note a week to DD's teacher (she's going to play practice so no bus, she'll be comeing home instead of to the afterschool program, etc.). DD and her grammy (my mom) write to each other every week and DD is always thrilled to get the letters in the mailbox. She also has a pen pal with a little girl we met while in Hawaii. They don't have a computer and she and DD (and the girl's mom and I) write back and forth frequently.
I love picking up notecards and note paper. There's something so comforting and thrilling about getting a real letter!