Contemporary Authors Online, Gale, 2003.
BookPage has a brief interview with Dav Pilkey.
Dav Pilkey has his own illustrated web site. To browse the site, you can choose either the cartoon or the text version. Either way, you'll find a biography, interviews and updates on his life and work, as well as a list of the books he's written and illustrated.
Houghton Mifflin publishes some of Pilkey's books.
KidsReads has a nice interview with Dav Pilkey, along with descriptions of several of his books.
Scholastic lets Dav write his own biography, which centers on how he got started writing and illustrating books.
Utah Education Network quotes Pilkey talking about his life as a small child.