B'z Official Site
The official site has news, a complete discography, updates on television and magazine appearances, preview clips, livegym bits, and a few nice pics that are changed regularly.
B'z Fanatics
It's not updated anymore, but Dave and Tom put together one of the best sites for beginners (and one of the first English B'z site around). It helped me a lot when I first wanted to learn more about B'z! Simple to navigate, it has good information that cuts straight to the point. Dave's reviews are also a must-read.
Keen's B'z Online Music Site
Keen-chan's behemoth site is the largest and most complete English-language shrine to B'z around. She has everything...everything!
One of the best parts is her Lyrics Translations Book, containing romaji and English translations so we can all understand the beauty of those lyrics. She also has choice music clips and a ton of info. And a provocative picture of Koshi, but you'll have to find it yourself.
B'z Love Driver
Webmistress B-chan knows her stuff all right. Her site has many entertaining reads and a creative touch, whether you're a casual fan or a hardcore one. She is also the NP videos stream queen.
B'z Pleasure
Lady Navigation's American site. No longer updated, but contains a lot of detailed, translated information and a discography that describes each first press bonus. The translated interviews are excellent.
Inako's 175 B'z
Also one of the first English B'z sites around, this Hong Kong based stop was one of the very first sites I ever visited. Contains a lot of great info, including some live reports, and some funny translated q&as from rare Be Withs.
B'z Net Party
A B'z BBS. You'll find all the latest news here, plus videos, plus other fans! The video service has 102 lives, pvs, and cms now. 102!! What are you waiting for?
Trash: A B'z Fanart Site
Maiyeng's very cool and new B'z fanart site. Come on, you know you want to draw them! XD Go contribute!
B'z sites in languages other than English, but you will want to go to anyway!
Kumagoro's B'z site
My favorite Japanese B'z site! Sadly, on a hiatus. Still, Kumagoro's site also has my favorite B'z fanart (done by Kumagoro) and copious information including a Song Index and every supporting member.
Edwiz and B'z
Edwiz' Korean site has rare multimedia, like mp3s from B'z secret lives! How he got those is beyond me! You MUST go to his jukebox and listen to the B'z rendition of Since I've Been Lovin' You (from the Survive secret live). Also a lot of multimedia and other stuff!
Fireball's B'z
Korean B'z sites are so fancy and comprehensive they make me cry. Fireball's B'z has the single largest B'z gallery out there. Not only that, but in the board where the pictures open up, you can click on buttons and turn them black and white, resize, etc.
B'z Brotherhood
Rounding out the Korean sites is Jk's Brotherhood, also rich in multimedia. Check here for PV, cm, and mp3 downloads, as well as other stuff.
Other Sites!
Shiroi Heya
Gerald and MS run this jrock blog that is rife with detailed music reviews, live reports, and comments on various aspects of jrock. Educational and well-written! They have several B'z articles in the archives.
Mognet
Super Moogle-themed translation site that is bigger every time I visit. Stiltzkin and Kumama are by way of being very knowledgeable B'z fans. They have several wonderful translations of B'z songs and lovely translations of many many other jpop/rock songs, complete with accompanying mp3s! They take requests too.
ProjectJ: B'z
One of the best, and best-written, introductions to B'z I've ever read.
The rest of the site is very informative too. And I wholeheartedly agree with their statement about Teru's voice in the Glay page! It's the sincerity!
Celga...New!
You know those yahoo jp auctions where all the B'z treasures are? That's where all the really good stuff is. Normally, no overseas bidding is allowed, but Celga can help you bid and they'll ship your items over to you. Just be warned that shipping from Japan can make you extremely poor! Keigo and company are all very nice, so check it out when you're desperate for some rare Tak and Koshi. :)