well it depends on the person. so I'll start.
If you look at the Books like みんなの日本語初級1初級で読めるトピック25 or New Approach Japanese Intermediate Course, the topics inside these books are very useful. The reason is, the information in (almost) every topic are based on research which can greatly help us advance in our daily life. Like the Sumo and the first TV in Japan (minna no nihongo topic 25) or the experiment about colors, parkinglot, etc. (new approach). The topics are written in a very easy way, that even a beginner could understand it.
If someone would ask me:
" Hey, you are learning Japanese right? "
" Umm... yes... why? "
" Can you tell me something about sumo? "
" sure, thanks to Jpod101
"
I doubt someone would come to me and say:
" Hey, you are learning Japanese right? "
" Umm... yes... why? "
" Can you tell me something about sumo? "
" No, but I can tell you what Miky did last week. "
" Who the hell is Miky? Look, I have a homework to do. I need to write something about sumo and not about a persons life. "
" I see... well sorry, I can't help you. "
In short, I (we) need informations that can help us progress both Japanese and about Japan.
" Dear Diary " Audio Blogs definitely helps us practice our listening and understanding, but thats about it. No information about Japan and its past nor neither research or science stuff. Only blogs about someone who went out last night to eat ramen. So what, everybody can do that.
Thats the reason why I choose
www.asagaku.com because I can also learn new stuffs everyday besides Japanese.