Andrea - please make any changes that you feel are needed.  There is lots of room for improvement every where in the manual.
Also, if possible, I would like to make a few typo and changes to the next chapters before you start working on them and will check in the .odt version as quickly as I can.  Thanks, Phyllis

>From the BlueBanana section, I took out an sentence, it is unnecessary
in a manual. In the Motion section I would like to add a Tip. What is
your opinion?
Blue Banana:
(-) The preceding sentence implies that this is a limitation in that
you can not just apply a Blur to the matte.
Motion:
(+) Tip: The motion vector is a text file located in /tmp. We can open
it with a plain editor and modify the wrong $X\,Y$ coordinates, i.e.
those that deviate from the linear interpolation, to correct the
errors that always happen when we perform a motion tracking (jumps).
It can be a long and tedious job, but it leads to good results.