Ongaku Tanoshimi

Japanese Lounge and Bossa. Dead but Alive.
http://ongaku-tanoshimi.blogspot.com/

Shibuya-Kei or Something

As the blog title says, international sounding 90's J-pop
http://shibuyakeiorsomething.blogspot.com/

The Vault

Japanese Music: Experimental, Electronic, Indie, Hardcore, Metal, Jazz, New Wave, Pop, Punk, Rock, Visual Kei. Picopop. Massive Blog.
http://voodoovault.blogspot.com/

NYU's Anime and Stuff

Lots of anime but also a ton of J-pop and Rock
http://nyu-anime.blogspot.com/

Lifer

A lot of great stuff here in various categories. Modern Shibuya-Kei, Prog, Rock, Power and Black Metal, Electronic, Experimental, Jazz
http://liferthereviewroom.blogspot.com/

Fatal! J n K Music

Lots of Japanese and Korean Pop and Rock
http://onlyjmusic.blogspot.com/

Tokky Dokiis

Japanese Pop & Rock, Visual Kei, and K-Rock
http://tokky-dokiis.blogspot.com/

Barbarism Begins at Home

Lot of great vintage (80's to current) Indie and Alternative with the occasional Hip-Hop and Electronic thrown in
http://lunchmatic.blogspot.com/

Naoridownloads

Japanese Pop + Indie - old and new
http://naoridownloads.blogspot.com/

Minipopcube

A lot of Japanese, Lounge, Bossa Nova, Pop, Jazz, Nu-Jazz.
http://minipopcube.blogspot.com/

Download Jpop

Japanese Pop, Anime Soundtracks
http://japanese-sound.blogspot.com/

The Unheard Music

From experimetal to rock and electronic. Some interesting unheard of tapes / outtakes too.
http://unheard78.blogspot.com/

Ferocity of Practical Life

Some great avante-garde, experimental, noise
http://lifeferocity.blogspot.com/

Know Your Conjurer

Lotta 70's gems, all kinds of genres but mostly experimental works.
http://knowyourconjurer.blogspot.com/

UAXUCTUM

Ambient, Drone, Experimental
http://uaxuctum.blogspot.com/

UTVAER

Free Improv, Krautrock, Ambient, Experimental, Free Jazz and in FLAC
http://utvaer.blogspot.com/

Serious F*cking Business

Ambient, Black Metal, Electronic, Free Jazz
http://seriousfuckingbusinessindeed.blogspot.com/

Steal With Me

Lot of genres here. Avante-Garde, Ambient, Classical, Folk, Jazz, Psychedelic,
http://stealwithme.blogspot.com/

Speakershock

Nice selection of Electronic, Downtempo, IDM, Hip Hop, etc
http://speakershock.blogspot.com/

This is the Universe

Don't expect new uploads but has a great fresh archive. Electronic, Indie, and Pop
http://thisistheuniverse.blogspot.com/