"Mince fresh parsley (or basil) and spread it out in a gallon zipper freezer bag and freeze. When it’s completely frozen squeeze out the air and roll it up and tuck it somewhere handy in your freezer. It stays green and you can use as much or as little as you want."
I agree. A mushroom reacts as a sponge. Taste becomes terrible. I'm picking my own mushrooms in the season (here, Belgium, from end of August till October, I go everyday and have a dryer)) and just brush away the dirt (if any). Be careful though, one has to know what he picks (my wife, a doctor, doesn't trust me and doesn't eat it :-) ) Other question, why does she let me to eat it :-)?
#2 I was always told that but watched Alton Brown from Good Eats disprove it. Soaked the mushrooms and compared the weights before and after. Minimal change.
The one about reverse taring isn't bad (although it's more about baking, don't see myself weighing things when cooking :D)
#18 I have always been told to freeze fresh herbs in water.
#19 Nuke a bowl of water or vinegar for a minute does the same thing.