I'm not one for writing Christmas cards...or any cards for that matter. I think it comes from having such bad penmanship...at least that's my excuse (my mother never bought it either). In any case, why not abandon or at least augment the hand cramp tradition with a video. Simple idea really...probably been done. Create a short "Merry Christmas/Happy Birthday/Insert any special occasion" video for each of your clients and post to Youtube. Get line staff involved, dress up as Santa...have some fun with it. I bet it gets passed around more than the paper version.