8th house deals w/ anything that falls under the realm of death, sex, resources, occult, psychology and the hidden/buried.
Pluto destroys and transforms. Keep in mind what Pluto is connected to: Judgment, Plutonium (used in Hiroshima's A-bomb), and Hades of the underworld.
So the connection w/8th leads us into areas of power/control, death/rebirth. The glyph of Pluto has the circle of spirit floating above the semi-circle of of consciousness/emotion, resting upon the cross of matter. So we also have the idea of transcendence.
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$: as opposed to the 2nd house which talks about personal wealth, 8th house deals w/control so it covers insurance, wills/inheritance, resources from marriage. From my own mind (so someone check me if I'm off the mark here), I'd link this to tax, perhaps pre-nup agreements, heirlooms.
sex: porn, BDSM (talk about control ^_~), sex trade work (hey, sex *and* resources!). My own conjectures: rape, abortion, venereal disease, menstruation, more mystical approaches to sex (ie Tantra), orgies. Also, b/c sex is a marginalized topic in our society, it is also "hidden", so I think the study of sex would fall under this area as well. There are also occult links to sex, but I'm not very knowledgable in that area.
death: funerals, taxidermy, autopsies, morticians, cemetaries, suicide. My own associations: martyrdom (death/ressurection, mysticism), Halloween/Samhain (will take this up later), ghosts
psychology: This isn't often covered, so from my experience I'm thinking... Freudian/Jungian analysis, dreams, neurology. Throw in control and security and you arrive at Pavlov and the behavioural-cognitive school. Mind control experiments and all the very unethical stuff that went down during the early days of psychiatry. Psychological meds might fall under here too. Forms of paranoid schizophrenia, bi-polar disorder (literally all-or-nothing)?
hidden/buried: psychoanalysis definetely falls under this category (the first occupation I was interested in was archaeology/paleontology - little did I know I'd spend the rest of my life digging inside my head
), but also on a more literal level, mining, detective work or any investigative work perhaps forensic work, espionage, organized crime (or is that more of a 12th house thing?)
occult: tarot! astrology! alchemy! Yeah! The 8th house *rules* ^_~
other areas I think might be applicable: mass graves, geology, war (power/control/death), demolition sites, garbage/recycling plants, sewage, intestine/bladder, churches, cults, despots, guerilla/revolutionaries, harems, Masonry, groups that deal w/resources (ie. IMF, biotech companies (patents, intellectual property etc)), chemical engineering
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Mars is still up for grabs as is the co-rulership of Mars and Pluto. If you're interested in covering these topics, pls post!