So I had a thought- the TF2 wiki has this, why shouldn't we? After all, spiral knights weapons are quite a bit more of an investment than are TF2 weapons.
I made a volcanic pepperbox video, and the first comment if got was:
"Great video. Thanks for sharing it. I really wanted to see a gameplay with this weapon. I was undecided about to buy or not the recipe of this weapon." ( http://www.youtube.com/watch?v=G4lWZDAkLTE )
SK lacks a preview feature for most weapons, and watching a video can be quite instrumental in deciding what weapons you want to go for. I remember looking for a video of a dread venom striker when I was a T1 knight, because I thought it looked and sounded cool, but couldn't find a good one. Having videos out also helps to promote the game.
I'd be glad to film any of the weapons that I have for the purpose, although I cannot edit the wiki as I am on steam.
There are some demonstrations for bombs up already so we certainly can add those in. Though you might want to structure your videos like at the start show the regular attack and charge and then show how to use it later.