Thanks to Peter Suber and Liz Allen for the exciting news that PLoS ONE is about to launch.
The Public Library of Science has been one of the highest profile open access publishers since 2003. Their initial publishing model is an example of "Open Access 1.0." PLoS ONE is typical of "Open Access 2.0," a more democratic system in which readers are encouraged to annotate, rank, and comment about articles.
Open access has always been about increasing access to scientific literature, and now more than ever will focus on enhancing discussion as well.