I found this Brilliant World War 1 website the other day due to the Rootsweb Derbyshire-L mailing list.
The site shows lots of background around the Ypres battles and shows some touching letters from soldiers back to their loved ones. If you had a relative who fought in the Sherwood Foresters Regiment (Derby/Notts) perhaps you will find this of use.
Link: http://www.ypressalient.co.uk/
