The Textpresso uses Arduino technology (aka the internet of things) to run via an Android application, where you can send messages from your dekstop. It's been built by ZipWhip who specialise in cloud-based text messaging.
You can check it out in action in the video below (excuse the cheesiness in the clip):
And you can even add a message you want with your coffee which will be painted on using edible text. Or if you don't add your own message, your cup will be printed with the last three numbers of your phone number, so you can identify your own brew on the waiting tray.
To post to this group, send email to email@example.com