Hugh Wallis provides a batch number search facility, which greatly simplifies the task of searching the I.G.I. for records from particular churches (useful, for example, in case of strangely-spelled names). A further batch number site is provided by Archer Software.
Glossary of terms related to church records, by Martyn Parsons.
The Official Non-Parochial BMD Records Service - a free index search facility for various unpublished registries from 1534 to 1865, from National Archives Refrences RG4 and RG5, with a pay-per-view access to the original records.
Lyon-Turner, G. Original Records of Early Nonconformity Under Persecution and Indulgence - 3 vols. T. Fisher Unwin, London (1911) [Online copies: Vol 1, Vol 2, Vol 3]
Two major marriage licence indexing projects: the Faculty Office Marriage Licence Index (of licences issued by the Master of Faculties of the Archbishop of Canterbury for the period 1714 to 1850), and the Vicar-General Marriage Licence Index (of licences issued by the Vicar-General of the Archbishop of Canterbury for the period 1701 to 1850 undertaken by the SoG are now on www.findmypast.co.uk.
Free searches of parish registers are provided by FamilySearch.
Breed, Geoffrey. My Ancestors were Baptists (4th ed.). Society of Genealogists (2002) 135 pp. [ISBN: 1903462525]
[". . . a history of the church plus valuable information on what records can be obtained. A complete listing of all Baptist churches and dates by county and appendices showing for instance the important collection in Dr Williams Library.."]
Catholic Heritage - website of a project to provide a centralised access point to an online collection of Archive and Library catalogues within the Catholic Church
Clifford, David J.H. My ancestors were Congregationalists in England and Wales: how can I find out more about them?, Society of Genealogists (1997) 77 pp. [ISBN: 0946789460]
["Following a useful introduction this book comprises a location list by county of Independent and Congregationalist registers to 1850. Many exist outside the Public Record Office. Details of chapels where no registers have been located are also included."]
Randolph Vigne. Huguenot Family Research Made Easier, Genealogist's Magazine 27, 10 (June 2003) pp. 447-449.
Oates, P.J. My Ancestors Were Inghamites, Society of Genealogists (2003) 149 pp. [ISBN 1 903462 77 0]
["Includes a brief history of the Inghamites, sections on chapels and their records, index of people referred to in the conference books of the Inghamites Societies, various baptism and lists of members."]
Joseph, Austen. My Ancestors were Jewish (3rd ed.), Society of Genealogists (2002) 60 pp. [ISBN: 1903462630]
["Covers the emancipation of Jews in Europe, marriage, death and burials, census, secular records, surname information, information on repositories, internet and more."]
Leary, William. My Ancestors were Methodists (3rd ed.), Society of Genealogists (1997) 116 pp. [ISBN: 1859514030]
["The main text [of this 3rd edition] has not changed but the appendixes detailing holdings in the SoG have been revised and updated thoroughly. The book explains the records of Methodism and what to expect from these records."]