I can't emphasize enough how blogging has positively affected my students' understanding of concepts. After some small instruction, students are so efficient at blogging about concepts that we can complete great blog posts in minutes.
It has taken some time (about 5 months), but students really can blog quickly!
For me it proves that digital devices can't be in a lab. They have to be with students, a part of students, an extension of students. Having them accessible all the time, allows for efficient reflection and creation!