Here are a couple of photos of the faint black line that I saw:
Now here are other photos I found on the internet that show the same type of line:
What is this? A guiding beam of some sort?
--- end ---
November 11, 2009 UPDATE
Here is a zoomed-in cropped satellite pic of Sonoma County from yesterday, November 10, 2009 (link).
Below are a couple of cropped photos from the other satellite for the same day (Nov 10, 2009), but over the San Francisco area (link) to show the massive spraying on an overcast/foggy day.
First photo is untouched and second slightly adjusted to better see chemtrails.