An interesting site,
with offbeat features like "400 Years Ago This Month" and a poetry machine. All of Shakespeare's plays are here, and a search engine is on the way. There are also reviews of recent productions and questionnaires aplenty.
Website for the Folger Shakespeare Library,
http://www.folger.edu/welcome.htm
the world's largest collection of the first printings of Shakespeare's plays. Huge number of links, including links to academic resources.
E-text of 2 King Henry IV
http://tech.mit.edu/Shakespeare/History/2kinghenryiv/2kinghenryiv.html