Favorite weapons from SF?

This blog posting was inspired by another blog posting to post their favorite ten weapons of science fiction. I've been thinking about this for a few minutes and I realized that the SF I have read hasn't had a lot of weaponry in it. Here's a few I can think of.

1) Corwdainer Smith has a story in which humans are telepathically linked to cats and the cats are in small ships (or some kind of contraption) and they patrol outside of a larger space ship, protecting it. Now that's a cool weapon.

2) I always liked that Heinlein considered the well trained individual the most dangerous weapon the in the universe.

3) They used sling shots on the generational starship in the story "Universe," also known as "Orphans of the Sky."

4) The remote controlled combat robots in "Forever Peace" by Joe Haldeman.

5) Those big machine guns Bruce Willis used in "The Fifth Element."

6) A heat ray weapon David Drake described in one of his short stories. The way they used it like a machine gun against an indigenous people still sticks in my head to this day.

7) OK, light sabers. They look awesome and sound even better.

8) The space warfare describe in Heinlein's novel "Citizen of the Galaxy."

9) The nanotechnology equipped service rifle used by the soldiers in Scalzi's "Old Man's War."

10) Every single sword that had a name in the Lord of the Rings.

How about ya'll?