CM had asked about this in the armor thread... but seems to me it needs to be its own thing.
One-handed: Axes, Daggers, Maces, Pistols, Scepters, Swords
Off-hand: Focuses, Torches, Warhorns, Shields
Two-handed: Greatswords, Hammers, Longbows, Rifles, Shortbows, Staves
Aquatic: Harpoon, Guns, Spears, Tridents
Whoops, forgot to credit the person: http://www.reddit.com/r/Guildwars2/c...eapon_gallery/Edit: There are a few weapons missing and some duplicates due to hasty screenshoting, sorry.
Edit 2: Added some aquatic weapons - the list was very placeholderish.