The Sakuga Wiki [JP] - http://www18.atwiki.jp/sakuga/
Catsuka: French/English Animation News - http://www.catsuka.com/
ANN Database - http://www.animenewsnetwork.com/encyclopedia/

Animation Blogs [Eng]:
http://www.pelleas.net/aniTOP/ | http://aninomiyako.wordpress.com/
http://sakugapowah.wordpress.com/ | http://vanishingtrooper.wordpress.com/