In September George Siemens and Stephen Downes co-facilitate an open online course on Connectivism & Connective Knowledge providing additional information in a support wiki for the course.
According to Siemens "Connectivism is a learning theory for the digital age. Learning has changed over the last several decades. The theories of behaviourism, cognitivism, and constructivism provide an effect view of learning in many environments. They fall short, however, when learning moves into informal, networked, technology-enabled arena"
In a handy table (published in a GoogleDoc) George Siemens indicates how prominent learning theories differ from connectivism (or perhaps network learning).