http://www.nic.io/ The .io domain is allocated for the British Indian Ocean area: http://www.nic.io/rules.html. Some start-ups seem to like using these types of top-level domains to build cutsey domain-hacks; http://pistacch.io, http://moustach.io/, http://twit.io/, etc.
From Wikipedia :
.io is the Internet country code top-level domain (ccTLD) for the British Indian Ocean Territory.
IO is a popular programmer nomenclature for Input/Ouput otherwise shown as I/O. It is also the devs way of being cute with the name
The use of the
.io domain has a few benefits: