General Sites (personal favorite J-music sites)
Bonsai's Jpop Pages Leading search engine and link directory for Japanese entertainment. An invaluable resource that'll help you find pages on any J-pop related subject you wish to find. The search engine is not as reliable as it could be however, but nobody's perfect I guess.
J!-ENT One of the most extensive sites about all aspects of Japanese entertainment. Music, fashion, movies, television, celebrities, mp3, gossip, karaoke. The site has even more value if you subscribe to the J-pop mailing list. This is because sometimes the maintainer will put up special stuff exclusively for J-pop ML members.
Japanese Channel regularly updated MP3, photos & more. Impressive site.
Megchan no shumi (friend's site) lyrics, pictures, trades & giveaways.
Japanese Channel Regularly updated MP3, photos and more
Rockin' Heaven One of the first great visual rock sites. But site will no longer be updated.
LunaSoul Reincarnated A very imaginative and original site with a cool 3D interface.
Angst and Ennui visual MP3 galore, L'Arc~en~Ciel, Sugizo, Lareine and misc goodies.
J-pop Trading Post A place for J-pop traders to be seen and contact other fans interested in trading.
IlluXions J-rock introduction and support
Japanese Channel Regularly updated MP3, photos and more
As.if.in.a.dream Interviews, L'Arc~en~ciel, GLAY, Luna Sea
Japanese Channel Regularly updated MP3, photos and more
Hi no miko's J-rock Closet L'Arc, GLAY, Luna Sea, Malice Mizer, X Japan, Shazna. RealAudio samples too.
  more links to come. I'm still sorting through my bookmarks.


MP3 & RealAudio
entrophy ~visual MP3~ More visual MP3 than you can shake a stick at
J-mart largest volume of J-pop MP3 on the net. A bit slow though. Never goes over 3K per sec (even with a 100K connection).
Japanese Channel MP3 Regularly updated MP3, my favorite daily stop
Kunoichi Syntax Many top 40 Real Audio songs and albums
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Where to buy J-pop and J-rock
CD Japan Vast selection of both major and indie releases. Anime as well. Even if you want something that isn't in stock, they can find any CD or video you can think of in less than a week. Fast delivery too. My most frequented online store. Great for fringe and indie music since most stores focus more on popular top 40 stuff.
Japanime.com Another great and reputable online store. Selection is good with most of the top selling artists, but you probably won't see many rare CDs on site. They have a finder service to locate goods, but from my experience it hasn't been reliable. Never once did I get a reply to a finder request. It may be just me though.
DEODEO.COM A promising online store that has a nice selection and is often cheaper than the competition because they offer free shipping. But damn it all, I can't try them out. They currently only offer the service to the U.S.A. and don't even sell to Canada yet.
Asia CD At first glance it seems as if this site only has Chinese music, but there's a fair selection of Japanese music as well. All of the Japanese CDs are not Japananese versions, but Hong Kong export versions. You basically get the same thing anyway and it's often 40% cheaper.
eAsiaGate All kinds of Asian goods from books to food to furniture. They also have quite a lot of Japanese goods among other Asian entertainment products, most notably CDs. Nearly all of the Japanese music CDs are official export versions which are quite a bit cheaper than originals.
Tokyo Pop They sell a lot of anime and manga, but look around and you'll also find Japanese pop and rock CDs. Selection's not too bad.
2nd Hand CD Shop There's a section for Japanese releases here. If you're lucky you may find a CD you've been looking for used for a really good price. This site acts mostly as a moderator between those interested in selling and those who want to buy. The pickings are sometimes really slim, and sometimes there's a lot of good deals. Since it's dealing with used CDs you have to expect that sort of thing. A lot more hassle than most of the stores above, but it's much easier on your poor suffering bank account.
Where to Buy Japanese Music Not an online store, but a page that lists some popular stores that sell J-music in California, Hawaii and Toronto.