Presentation to Video conversion I'd like to make several online language courses, and was thinking about incorporating video into a lecture.

I was looking for a way to convert presentations (PowerPoint or OpenOffice) directly to some video format, or, indirectly, maybe through Adobe Flash format.

Right now I'm on a Ubuntu.

Maybe there is some kind of tool, like FFmpeg style?

Thank you again!
What you are looking for is called a Screen Capture program or Screen Cast program.  A quick Google search turned up gtk-recordMyDesktop as an option that should work for your purposes and appears to be built in to Ubuntu.  This was the site I found that explained more detail on how it is used.  I personally have no experience working with Ubuntu, let alone screen capture on it.