Blog on Blog

I need some help here.

I want to propose/propogate 'Blogging' as a 'breakthrough means of learning'.

any ideas, people?

Will keep updating my (utterly meagre) knowledge on the subject as we move on. Lets start at the very beginning:

In my limited experience, blogs have started for a variety of reasons:
· A resolution to do some ‘real’ writing
· A forum to opine
· An experiment with the Internet
· A means to make new ‘friends’ (ummm...)
· A chance to broaden perspective

(do add to the points here, and more importantly, answer the question: How does a blog help you learn?