Saw this post at Ars Technica describing a service called BigString that allows one to send self-destructing email. They do it by sending an image of whatever text you type, and then depending on the parameters you set, make that image (still actually hosted at BigString) expire after a certain time. What intrigued me about this is that we're about to launch a post-to-web document delivery service here that supposedly does something similar. Once the recipient has printed the article once it's deleted from our servers. I was curious to know if BigString could be used as a poor-man's post-to-web document delivery service. Alas, only text entered at the site can be converted and tracked, so no way to scan an article and send it through the service. Neat idea though.