An Incomplete List At Best

Wizard Entertainment has a list of the "ultimate fictional weapons", including Glamdring (Lord of the Rings), Mjolnir (Thor's hammer), railguns (The Eraser) and He-Man's Power Sword, among others.
Stunningly missing, however, is Neal Stephenson's Reason. I hope Wizard are ashamed at their oversight and that they correct it with all due haste.

He Man Does 4-Non-Blondes

Words simply cannot describe the dance hall atmosphere that has overtaken Castle Grayskull.