SourceForge, which is behind several media properties including Slashdot, SourceForge.net, Linux.com and Freshmeat.net, is announcing today that it is including OpenID functionality in its SourceForge.net website. OpenID, of course, is an open, decentralized framework for handling digital identities and authentication. It eliminates the need for multiple usernames online. Many big companies, including Google, Yahoo, IBM, and Microsoft (OpenID can be used with Windows CardSpace) employ OpenID. SourceForge's move, and the extent to which it's embracing OpenID, makes it one of the largest implementers yet.