Steira is a minimal theme for WordPress by automattic.
Steira Theme download: http://wordpress.org/extend/themes/steira
Automattic, Inc. is a web development corporation founded in August 2005 it is the company behind WordPress.
Other Automattic projects include:
After the Deadline — online proofreading tool
Akismet — anti-comment spam system capable of integration with many blogging platforms and forums
bbPress — forum software
blo.gs — RSS feed aggregator
BuddyPress — social networking plugin suite
Ping-O-Matic — pinging service
GlotPress — collaborative translation tool
Gravatar — globally recognized avatars
IntenseDebate — commenting tools
PollDaddy — polls and survey tools
WordCamp — series of conferences for WordPress users
VaultPress — backup and security service for WordPress sites
VideoPress — hosted HD video for WordPress sites
More automattic WordPress themes:
http://wordpress.org/extend/themes/profile/automattic