Well, I never had blog before, not even an spanish one. I think this has been a very nice experience. I really enjoy writing in my blog and I'm going to miss it next semester :/
I personally believe that this is a very good thing for students because they can practice not only their grammar but their vocabulary. And, of course, writing a blog not only improove your english skills. You can express yourself by putting your thoughts in words, wich is always a good thing.
I think all the subjects were chosen very carefully. I didn't feel uncoumfortable with none of them because, in general, they were easy. I can't tell you which I enjoy the most because I enjoy writing each post.
On the other hand, I was able to meet some new people with different ideas. I hope we can keep in touch :)