ClassicTVHits.com: Perry Mason: Includes a show summary, cast information, and pictures.
FatPat's Mason Page: Downloadable books in German and English, pictures, theme song, and wallpapers.
IMDb: Perry Mason: Cast and production information.
Perry Mason TV Series: Cast information, images, episode guide, mailing list, and replica of "The Perry Mason TV Show Book" by Brian Kelleher and Diana Merrill.
The (Slightly Paul-centric) Perry Mason Page: Includes screen captures from the show.
Total Danger: PerryBase: Complete episode guide to the Perry Mason series.