Sorry not to get back to you sooner - had to go out to work just after posting and didn't get back till very late.
Brian Lawson's very useful indexes are now on the Isle of Man Family History Society website:-
www.iomfhs.im - then click 'Research' in the green panel.
Or just copy & paste :-
www.iomfhs.im/default.aspx?CategoryID=22
into your address bar and that will bring up the Research page directly.
I personally think it would be great if this useful link could be tabbed from this Message Board website, but I don't know if that's possible.