Excellent resource about the Middle Ages in Britain from Timelines TV. There are usually four short clips on each of the following (Flash required):
The Medieval Manor: http://www.timelines.tv/ipA01.html
Medieval Towns: http://www.timelines.tv/ipA01.html
Monastic Life: http://www.timelines.tv/ipA04.html
The Black Death: http://www.timelines.tv/ipA05.html
The Normans http://www.timelines.tv/ipB01.html
http://www.channel4.com/history/microsites/C/castle/roc_tour.html
Take a virtual tour of some of the most famous castles in Britain.
http://www.middle-ages.org.uk/facts-about-knights.htm
A collection of interesting facts about Knights – the tanks of the Middle Ages.
http://www.pbs.org/wgbh/nova/lostempires/trebuchet/
Interesting student site from PBS called Medieval Siege that accompanies a TV programme where a team of experts try to build a giant medieval catapult called a trebuchet. Interactive features include a game where you design your own trebuchet (click on Destroy the Castle).
http://www.channel4.com/history/microsites/W/worstjobs/medieval.html
3 pages of some of the worst or disgusting jobs in the Middle Ages from the Ch 4 site
The Worst Jobs in History .