Be very selective in what you use from the internet. Here are some selected theatre websites that may help in your research.
Open Directory Project "highly selective directory of internet resources."
A Brief Guide to Theatre and Performance Studies Maintained by Ken McCoy, Stetson University
Literary Resources: Theatre and Drama Maintained by Jack Lynch, Rutgers University
Academic Info: Drama Digital Library
Performing Arts. Theater in the Yahoo! Directory
WWW Virtual Library: Theatre and Drama
BUBL LINK: Catalogue of Internet Resources
Global Performing Arts Database
TheatreHistory.com
APGRD: Archive of Performances of Greek and Roman Drama "an interdisciplinary research project on the international history of ancient drama in performance"
Shakespeare Resource Center ..."find here collected links from all over the open internet to help you find information of William Shakespeare"
Picture of Shakespeare portrait courtesy of Flickr and Creative Commons