the theme is literature, English literature of course.
I have found a couple of sites that I would to share with you guys

http://guides.lib.udel.edu/content.php?pid=163874&hs=a
this first one is great because it is like a libraby but then online, you can find biographies, books or e-books, the critism on the books, sources, websites, newspapers.
so when you want to do a lesson about literature, or you want them to read a good book or you want to let them do research about literature you can use this link.

http://www.bibliomania.com/0/0/frameset.html
this is a library, there are over 2.000 books on this site in English. so when you want your students to read a chapter of a book and do some questioning about it, you can search a good book on this site and very easy print it.

http://www.loc.gov/homepage/lchp.html
this is a site where there are no books, but more biographies about the country of England and America, which can be very interesting if you want the students to know more about the country, there are texts about the arts, sports and leisure, history, politics etc.