The World Economic Forum has announced its list of 31 Technology Pioneers for 2011. The Technology Pioneers are its list of up-and-coming startups. Last year’s list included Twitter, Playfish, and Boston Power. The year before, Mint, Etsy, and Brightcove were named.

Joining the pantheon this year are foursquare, Knewton, Layar, Scribd, and Spotify. However, greentech is equally strong on the list, particularly with smartgrid companies such as OPower and Tendril. Below is the full list of infotech companies that made it, with links to their Crunchbase profiles for more information:

Aster Data (big data)
Atlassian (product management)
Foursquare (Geo-location)
GetJar
Knewton (adaptive learning)
Layar (augmented reality)
NetQin Mobile (mobile security)
OpenDNS (domain names)
ReputationDefender (online reputation monitoring)
Scribd (online documents)
SecondMarket (private securities market)
Spotify (streaming music service)
Vortex Engineering (low-power ATMs)