http://www.isle-of-man.com/interests/genealogy/fhs/intro.shtml
and
http://www.isle-of-man.com/interests/genealogy/fhs/fhs_app.shtml

There are other pages too. Look for Family History Society in the blue strip down the side of the home page, and a menu will pop up with other pages.

Also would seriously recommend Janet Narasinhams book on the Manx Family Tree, which is advertised on this society's pages. It is essential reading for the Manx Genealogist.