Derbyshire Lads at war- A website by Andrew Hesketh who is currently researching the war memorial in Tibshelf Derbyshire- http://www.derbyshirelads.uwclub.net/
The Great War Forum- For discussions on all things Great War Related- http://1914-1918.invisionzone.com/forums/
The Commonwealth War Graves Commission- They maintain the cemeteries and memorials and have a searchable database for finding casualties of both world wars- http://www.cwgc.org/
In Memories- A website by Pierre Vandervelden, of Belgium- An excellent guide to the cemeteries and memorial in Belgium and France- http://www.inmemories.com/
Chesterfield Sherwoods on the Somme- A website by Mike Briggs- An excellent guide to the Sherwood Foresters who fought on the Somme in 1916- http://homepage.ntlworld.com/mike.briggs76/
The British War Memorial Project- A volunteer project aiming to photograph all British War Graves around the world. They have a photograph request service- http://www.britishwargraves.org.uk