Blogging for learning?

An absolutely fantastic way of way of evidencing a learning journey, developing literacy and e-skills around a particular theme. Have the students set up a blog about a topic, e.g which is better Xbox or ps3, have them research features, costs, aesthetics etc and then discuss findings on there blog. Using mobile devices they can upload pictures / videos outside of the classroom, maybe on a trip or visit to pc world as supplementary evidence. Obviously consideration around blog safety and security is paramount however they can be set to private if not within a domain and also permissions can be set.