Here are some other websites you might find useful.
Bellaghy Historical Society
Family History Society - Coleraine Branch
1859 Griffith's Valuation for Co Londonderry
1859 Griffith's Valuation for all Ireland
Search for names in Graveyards around the Magherafelt area.
Search for names in Lavey Parish Graveyard
Lavey Parish Baptisms in the 1800's
Lavey Parish Marriages in the 1800's
Search for an Irish Townland
Worldwide noticeboard for ancestral researchers
Ulster Place-names Society
Northern Ireland Place-name Project
Find out a little about the culture of Northern Ireland
Locate towns, villages and postcodes in Northern Ireland. (and the rest of the world)
If you discover any broken links, please let me know.
Also if you are aware of any other websites that may be helpful
to anyone researching families from the Castledawson/Bellaghy/Maghera area, please let me know and I will add them to this