All Japanese All the Time: The layout is a bit busy, but it's full of useful information.
Japanalicious: An active blog about Japanese Language, Culture and Travel.
Learn Japanese Blog: Lessons, characters, counters and more.
Lingualift Japanese: Check out the Top 100 Resources for Learning Japanese. Sugoi!
Wired in Japan: a blog about learning the Japanese language and the blogger's experiences living and studying in Japan.