Mail A Letter…online is just like sending email, but it imprints your message onto a thin, highly portable lignin-cellulose substrate using a solution of carbon black in petroleum distillates. Then it envelops the resulting document to protect it, prints the recipient's address on that, and then apparently something else happens and it eventually arrives.
For this they want at least $1.52. Attention hackers: apparently it is possible to do all this without even using a website! You can get your own cellulose preparations and inscription chemicals. Yet it is still not free of charge to "send" the result? Some soldering skill might be required too, I haven't looked into it. (via HN)