Reader's Theatre is a great oral reading exercise. Put Reading First, a booklet published by the U.S. Department of Education et al (2001), states that "Reader's Theatre provides readers with a legitimate reason to reread text and to practice fluency. [RT] also promotes cooperative interaction with peers and makes the reading task appealing."
Reading Online provides a resource to help you get started.
Here are more helpful links:
Reader's Theater Scripts and Plays
Reader’s Theater Editions
Stories To Grow By
Have Fun Teaching
Scripts For Schools