Sister Sites

Senshi Gakuen Main - For everything.
Guestbook - For signing.

Mina-P's Translation Hall - For translations.
gravity - For Winamp Skins.
glass - For CG-colored manga art.
Aqua House - For manga reviews and shrines.

Official Sites

V6 Official HP (Japanese)
Johnny's Official HP (Japanese)
Gakkou e Ikou! -- V6 (Japanese)
Viva Viva V6 -- V6 (Japanese)
Love Sen -- KamiSen (Japanese)
Itou-ke no Shokutaku (The Itou Family's Dining Table) -- Ken-ken (Japanese)
MOBI -- Nagano-kun (Japanese)
Ponkickies 21 -- Inocchi (Japanese)

Fan Sites

V6 Love (English)
An English fansite with some fun translated interviews.
ARA-V (Japanese)
A great fan site with information on BOTH V6 and Arashi. Wai~!
V6 no Heya (Japanese)
Another favorite site of mine. This has information and links to every single V6 project, EVER.
Winter World (Japanese)
Although it claims to be an Okada-kun fan page, this site has summaries for dramas and variety shows featuring all of V6.
NATURAL (Japanese)
The transcripts that I love are gone, but it's still up-to-date with a V6 diary.

Commercial Sites

CD Japan
My favorite English site for ordering Japanese CDs and DVDs. Really sweet people and reliable service, too.
Amazon.co.jp (Japanese)
My favorite site with a great selection of CDs, DVDs, Books, Games, etc. and it's reliable, too. While the site is in Japanese, the ordering is not. How's that for odd.
HMV.co.jp (Japanese & English)
I haven't ordered from them yet, but their website is INCREDIBLE~! The entire thing translates into English, and you can listen to tracks from many different artists (although not V6).