"The Political Dr. Seuss", an exhibit curated by Richard Minear at the Connecticut Valley Historical Museum, Springfield, Mass. (11 Mar. - Oct. 16 2000).
Hotel del Coronado Celebrates Seuss (events leading up to the "Seussentennial" -- Theodor Seuss Geisel's 100th Birthday on 2 March 2004). This page is no longer here.
Universal Studio's Seuss Landing (theme park, Orlando, Florida)
Seussical, official site by Lynn Ahrens & Stephen Flaherty (co-creators of the musical).
Edward Connery Lathem's Who's Who and What's What in the books of Dr. Seuss (Hanover, NH: Dartmouth College, 2000). Alphabetically arranged concordance of people, places and things in the "Dr. Seuss Books of Theodor Seuss Geisel" (i.e., it does not cover the books written under other names). Note: this is a pdf file.
A&E Biography: Dr. Seuss. Very brief bio. The two-hour episode (premiered on 30 Nov. 2003, at 8 p.m. Eastern) once had a page at A&E, but I don't know where it may have gone.
National Public Radio's Fifty Years of "The Cat in the Hat." (1 Mar. 2007). Features audio, links to other stories, and a large chunk of The Annotated Cat's Introduction.
GRINCHY (Yahoo!), maintained by Jessica, who also has a Grinch site that features images of the Grinch and Grinch toys.
Seuss-related:
This Is Ann (1943), text by Munro Leaf; art by Dr. Seuss. This is not exactly as the pamphlet originally appeared, but it does include text and art from the original pamphlet.
Jones, Chuck. Google's directory of sites on Chuck Jones.
All Things Thurl, created and maintained by Brian E. Jacob. Devoted to Thurl Ravenscroft, who sings "You're a Mean One, Mr. Grinch" on the 1966 animated TV-special
Terri Birkett's Truax. Illustrated by Orrin Lundgren. Memphis, TN: National Oak Flooring Manufacturers' Association, 1997. According to the website, the book was "[w]ritten specifically to counter the book The Lorax, by Dr. Seuss." (No longer here.)
George W. Bush's "President Announces Early Childhood Initiative." A speech given at Pennsylvania State University, Media, Pennsylvania (2 Apr. 2002). In it, Bush remarks, "Sometimes when I sleep at night I think of Hop on Pop."
Jim Burrows' "Nerd Corner: A Brief History of the Nerd": a brief history and etymology of the word nerd (believed to have been invented by Dr. Seuss in If I Ran the Zoo, 1950).
Chase Group's Dr. Seuss Archive: buy reproductions of Seuss's paintings, sculptures, illustration art. Includes a biography and Audrey Geisel's reminiscences.