My first screencast! OK, actually it is my 3rd. The first one was a movie of my cursor moving around on the screen (I'm saving that for the bloopers reel), and in the second (my first real attempt) I forgot to move a window. The fact that I got this on the 3rd try tells you something about how easy it is to do this (though adding the comments takes a little time).
Anyway, this screencast gives a very brief overview of molecule-building with Avogadro and setting up a GAMESS input file.