1914-18 All about the soldiers, units, regiments and battles of the British Army of the First World War.
Canadian Letters and Images Project A project to publish letters from Canadian servicemen and other material. Not much aviation material there yet - but watch this space!
Cemeteries of WW1 A developing site, with photos & descriptions being created for every WW1 cemetery in France and Belgium - and a number of other countries too!
Military Archive Research The web site of Dr Stuart Blank - who undertakes research at many of the UK's historical archive facilities
Military List Everything military, from Air Force 1 to Westpoint. A good selection of links to other WW1 sites on this page - plus loads of other stuff on other wars too ..
Old Front Line Excellent beginnings. Really useful web site on WW1 generally, but British units in particular