Handwrytten - Handwritten notes straight from your device. Huge selection of cards or design your own. Handwriting service integrates with 1000's of apps.
Creddon - Tweet for a cause and a sponsor will donate $1 to charity
Thankbot - Drive more business with handwritten notes
Send Mail Get Mail - A postcard-sending website.
New Tab Startup Quotes - Inspiring startup related quotes in every new Chrome tab.
Postacard - Text a photo to send it as a postcard for $3.