There appears to be a resurgence of interest in hauntology afoot. Or perhaps it's more of a consolidation of interest, a recognition of the idea/genre as not merely a trendy buzzword but one of the defining themes of the past ten years or so, bringing together concepts such as nostalgia, media technology, decay, and memory. This old-ish post on the Wire's blog is something of a Rosetta stone for the concept, touching on some important online writing about the topic as well as linking to most of the major groups and musicians usually considered hauntological.
If reading about hauntology doesn't interest you then you should at least start downloading Jon Brooks' affable Cafe Kaput podcasts. Brooks is better known as Ghost Box artist The Advisory Circle, whose wonderful Other Channels is probably my favorite record from the label and whose Mind How You Go has just been reissued. Brooks' podcasts feature tracks from a wide range of music genres and periods--even advertising jingles--but much of it is drawn from '60s library music records and soundtracks, so they're very current for their time and yet totally obscure, giving you the uncanny sensation of hearing pop hits from an alternative timeline.