This paper presents the experience of an innovative educational project on continuous assessment of students' learning using blogs implemented by a group of teachers at the University of Valencia and the University of Castilla La Mancha during the 2010-11 academic year. Three types of assessment were implemented by the use of interactive blogs: a) using comments; b) through posts; c) joining blogs as administrators. The experience shows the potential of blogs as an instrument for autonomous work of students and the updating of traditional forms of assessment.