Okay, for the chloroform questions:
1. Chloroform is considered to be "toxic" at levels as low as 500ppm. It causes dizziness, fatique and headach around 900ppm. Not sure what the levels were in the trunk.
2. Chloroform has relatively low reactivity, it isn't water soluble but IS lipid (fat) soluble, it isn't readily metabolized by humans, and the biologic half life is realtively high. Biologic half life is how long it takes to remove half of the initial concentration from the bod. This means if I have 10ppm in my body and it takes 9 days to remove half, after nine days I have 5ppm left. Then it takes another 9days to remove half of the 5ppm left, leaving 2.5ppm after 18days (two half lives). The result is that it takes a LONG time to reduce the amount in the body, and it will (mathematically) never be completely removed from the body. These properties are what contribute to its carcinogenic properties and are the reasons why it damages the liver and kidneys. Not sure what the chloroform half life is, but I'll assume that it would accumulate in the system and there would be some symptoms/side effects if used over long periods of time.
3. You can ACCIDENTALLY make chloroform with household cleaning products. The combination of household bleach (calcium hypochlorite or soduim hypochlorite) and either acetone (nail polish remover), ethanol (the stuff that gets you drunk), butanone (also called methyl ethyl ketone....it's in dry erase markers, some glues, and some paint removers), or isopropyl alcohol (rubbing alcohol). My point being that someone could have accidentally made chloroform when they cleaned up the trunk with bleach and it combined with gasoline (with ethanol added) that had been spilled in there (from gas cans).
4. If the chloroform in the trunk was from a decomposing body, my guess is that the smell of the compounds mentioned in (I think it was) eddeva's posts would be WAY stronger and more concentrated than the chloroform.
Now here's my question/what I'd like to know more about:
It would be very useful to know how much chloroform is typically released from a decomposing body, if there was any residue/evidence of cleaning compounds/household products in the trunk of the car (if chloroform was accidentally made when the car was cleaned) or which products the A's kept in their home that could be combined to make chloroform (on purpose to use as a sleep aid).
If we knew this info, we might be able to figure out more about Caylee's death.