http://www.japan.alloexpat.com
Japan Expat Info Center Guide – Japan General Information provides Expatriates with the Useful information for immigration, visa, work permit.

www.workpermit.com/japan/japan.htm     
Workpermit.com guide to immigration to Japan, work permit

www.tokyovisa.co.jp
Nakai Immigration Services provides professional legal services to anyone looking to obtain a visa for entry into Japan

Immigration Information Center
Immigration Information Center provides Information regarding immigration and all related matters

http://www.mofa.go.jp
Complete information on Japanese visas, immigration