Chemtrails?

Has anyone else heard of this? :-? From what I've run into this morning it's a rather serious deal in the UK, and some here in the states. More than likely just another NWO type conspiracy theory, but I was just curious if anyone knows of, or has been affected by it, as so many of the claims I've just run into seem to suggest. Google and Youtube is full of info on this, but in the age of digital manipulation, it's hard to trust anything other than a personal account from someone you are familiar with. :-/