Okay rant over. With Dr. Seuss' birthday, I have compiled a list of some websites/activities.
Dr. Seuss Ideas
Seussville - Games and activities for the classroom.
Wikipedia - Research on Dr. Seuss.
Biography.com - More research on Dr. Seuss (includes a 4 minute biography video)
Biography Information - Even more research about Dr. Seuss.
Read Across America - Information about Read Across America.
You Tube - Tons of Dr. Seuss videos including The Cat in the Hat, Horton Hears a Who, and many more full length cartoons.
Biography.com - 4 minute biography video about Dr. Seuss.
Oobleck - Make oobleck from the book Bartholomew and the Oobleck following these directions.
Tons of Activities - There are activities listed for most of Dr. Seuss' books. This site is full of great ideas!
My TPT Product - I have to include my Dr. Seuss Activities.
I hope that you find something fun to do with your students!