My post yesterday, noting that even Twitter Wizard Ashton Kutcher uses personal stationery when the message is meaningful, has a short postscript noting the practice of crossing through one's name when writing a very personal note.
Here's an example from the slide show at Details Magazine showing congratulatory notes on their 10th anniversary:
I had never heard of this custom until queried by a writer recently. I have heard second- and third-hand that this is an indication that the note is of the most personal and respectful nature. I went to my go-to source - Google - and for once it was no help.
So, please help me and stationery-lovers everywhere learn the details of this custom. Original sources are welcome, as are stories from your childhood.