There's good reading right now from Emily at Strangechord. Emily is involved in Peak Oil advocacy. The Peak Oil theory is that we are soon approaching the end of oil that is easy and cheap to extract from the earth, and that in the future oil will be much less plentiful and exceedingly expensive, which will have a huge impact on the world's oil-dependent lifestyle.
Emily is blogging and linking about peak oil in general and about how Hurricane Katrina impacts the world of oil. Check it out.