ClassicTVHits.com: Perry Mason
Includes a show summary, cast information, and pictures.
http://www.classictvhits.com/showcards/perrymason

FatPat's Mason Page
Downloadable books in German and English, pictures, theme song, and wallpapers.
http://www.angelfire.com/film/mason_fan/

IMDb: Perry Mason
Cast and production information.
http://us.imdb.com/title/tt0050051/

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.
http://www.perrymasontvseries.com/

The (Slightly Paul-centric) Perry Mason Page
Includes screen captures from the show.
http://www.vividinfinity.com/perry_mason

Total Danger: PerryBase
Complete episode guide to the Perry Mason series.
http://www.totaldanger.com/td_pages/perrypages/perryframeset1.html