The History of Troilus and Cressida
http://william-shakespeare.classic-literature.co.uk/the-history-of-troilus-and-cressida
HTML text of the play.
Mr. William Shakespeare and the Internet
http://shakespeare.palomar.edu/
An excellent starting point in exploring Shakespearean resources online.
Arkangel Complete Shakespeare
http://www.arkangelshakespeare.com/
The Arkangel CDs, which contain live performances of Shakespeare's works based on the Pelican texts, are available at many public and university libraries.