Hitoshi Doi's Seiyuu Database
Comprehensive database with photos, voiceography, discography (with CD cover scans), articles, interviews, events and index of available merchandise. Database searchable by genre, title, or actor. [Japanese and English]

Anime Voice Actors/Actresses
Extensive list of Seiyuu links.

Seiyuu Enterprises
Fan clubs for Hayashibara Megumi and Mitsuishi Kotono. [English and Japanese]

Seiyuu Directory
Tribute to Japanese voice actors. Includes features on selected Seiyuu with pictures, profiles, history, commentary, and links.

Perry and Ansatsusha's Seiyuu Page
Voiceographies with images of the anime characters.

Ryu's Seiyuu Infos
Database with character images and seiyuu galleries.