Here are some sites with more information about the First World War.
http://www.bbc.co.uk/history/worldwars/wwone/ This site from the BBC offers a virtual tour inside a trench.
http://firstworldwar.com/ This large site contains biographies of the major players, newsreel footage, diary accounts and video of the battlefields as they look today.
http://memory.loc.gov/ammem/sgphtml/sashtml/sashome.html This Library of Congress site has World War I issues of Stars and Stripes, the official US Army newspaper.
http://news.bbc.co.uk/1/hi/special_report/1998/10/98/world_war_i/199768.stm A second BBC site with audio interviews of veterans.
http://www.greatwar.co.uk/westfront/ypsalient/meningate/lastpost.htm This page describes the Last Post Ceremony at Ypres, Belgium. A tribute to fallen soldiers that has been held every day since 1929.
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=9792310 A photograph of the grave of George Lawrence Price, the last soldier killed during the war.