Showing that this idea is far from done - some new and new-ish Hauntology related stuff online:
There's an excellent short documentary (and accompanying interview) on Position Normal who is, rightly or wrongly, considered the Godfather of Hauntological music.
There's a great looking group hauntology blog called Found Objects.
Thanks to K-Punk for those.
And also there's an interesting panel discussion including the Ghost Box lads Julian House and Jim Jupp who among other things talk about the spectres haunting their work.