Free Software for Movie Production?

Ploum asks: " Like some folks, I like to take my mini-dv camera to make films. First, I was using Premiere, then Avid Xpress on Windows. But now I want to make [a movie] on my Debian box. Everybody says that video under Linux is not possible but I want to do it! I want to write the scenario on Linux (maybe with a set of Latex commands or SGML?). When all is in the box, I want to put it on my computer. Dvgrab does a perfect job! Now I'm looking for a video editor. Cinelerra is nice but it doesn't read files from dvgrab. When it's time to have fun with FX, I was using Adobe After Effect, but [are there similar programs for Linux]? Film Gimp? Jahshaka?"