This is a nice overview of the franchise and the different continuities. Details about things like plot and characters can be saved for articles on the individual series and movies, I think.
That said, I'm going to lock this since it started out empty as per our current rules -- please read the sticky thread at the top. Discussion threads should start off with something substantial, even if it's as simple as just wanting to ask for others' opinions about how the article is. Just make it something more than the standard "hit reply to comment" message that we've got. If anyone would like to discuss GiTS' Wiki content further, by all means create a new discussion thread with your thoughts. I'll be happy to merge my comments with the new thread at that time if desired.
I would suggest that it's not the medium, but the quality of perception and expression, that determines the significance of art. But what would a cartoonist know? -Bill Watterson