AME: Karekano
This lovely site has many Karekano downloads, mp3s, pictures, summaries, great links, etc. Definitely one of the best.
Into the Dream**Karekano
It is not in english but is easy to navigate. Has awesome images, great informative synopsis, cute wallpapers + writing paper. A good Karekano site all together.
Hontou No Watashi
Another great great karekano page, has fanfics, fanart, screenshots, images, manga stuff, everything!
::Absense*Love*Progress::
An awesome site, very organized and cute. Great fanfic and lots of good stuff to browse.
Alice-chan's Wonderland Karekano
Great english/france site, a lot of great karekano stuff. Also has some nice LD scans.
AMO: Karekano
This page has all the summaries for most of the episodes and has a great character profiles with screenshots as well. A must visit for those that have not seen the TV series.
The Tsubasa Shrine
Tsubasa Shrine for fun!
Solitude
Excellent, dedicated Arima shrine.
Karekano Page
Very good Russian site!
Kareshi Kanojo no Jijo
Another cool karekano fan page.
Tomoyo's Anime Album: KareKano Page
Great page lots of neato info and nice layout.
Kareshi Kanojo no Jijo
Good stuff!
Doki Doki Karekano Review
General Karekano information with very cute images.
Doki Doki Karekano Review
I believe this is the first Karekano Yaoi site in English~ Go check it out. If you don't know what yaoi is, well basically is like boy-boy love. :p