Links to some of the sites I have found useful in my research
Pirton a site dedicated to all things to do with the village of Pirton
Pirton History excellent site with many transcribed records including all census, parish BMD's and wills.
Herts at War a site dedicated to listing all those mentioned on war memorials in Hertfordshire
FreeBMD indexes of Births, Marriages and Deaths from 1837 (not totally complete as yet)
General Register Office Great place to search for birth & death records and order copies of certificates
Familysearch the website of the Church of Later Day Saints, contains a vast amount of searchable information
Findmypast the subscription site I use