You will find some of these sites to be a bit overwhelming, but I have attempted to put the easier ones first.
Email your comments to fred35@earthlink.net .
http://www.benolit.freeservers.com/JuniorLinks.htm This site has links to Early England, Middle English, and the Renaissance.
http://orb.rhodes.edu/encyclop/early/pre1000/ASindex.html This site is pretty comprehensive with links to maps and articles.
http://www.mala.bc.ca/~lanes/english/engl200/lec200_2.htm This site concentrates on Old English's origins and is not really that brief.
http://www.britannia.com/history/time1.htm This site offers a basic time line with good links.
http://www.battle1066.com/intro.html This site shows what happens when someone is dedicated and has a good understanding of webpage design. The time line is presented like a genealogical tree with links that explain each phase of England's history in incredible detail. WOW!
http://www.battle1066.com/intro.html Here is a good page full of the biographies from Alfred to Alfred II. It has some wonderful drawings so that your students can see what the mighty rulers looked like.
http://www.cumber.edu/engl331/webslides/saxons/sld001.htm This site offers a good example of how to use Power Point to hit the highlights. The show could be adapted or shown with the aid of a projector. (If you do not have such a projector at your school, why not ask for one or write a grant for one?)
http://www.britarch.ac.uk/info/tours.html This site is not incredibly complete, but the concept is wonderful. I am sure that it will grow in time. It is easy to navigate, and you will find some use for it in your classroom.
http://www.britarch.ac.uk/info/tourst.html I couldn't resist adding this site. I spent hours exploring.
http://www.gallica.co.uk/contents.htm The textbook that I have been using for years says that not much is known about the Celts. But, the book is old, and sites like this one are the wave of the future.
WARNING The next to sites offer soooo many links that I cannot be held responsible for the time that you spend exploring.
http://www-sul.stanford.edu/depts/ssrg/medieval/oes.html
http://www.wsu.edu:8080/~hanly/oe/503.html