The Perfect Captain’s Swamp Fox is a set of rules for American Revolution campaigns.
campaign
Pigs and Glory Viking Campaign
Pigs and Glory is a campaign game for a Viking campaign.
American Civil War Campaign Rules
The DFW Grognards have published a set of ACW Campaign rules.
Niagara 1814 Scenario Book
Niagara 1814 is a scenario book for Blackpowder. As with any book of scenarios, however, they can be adapted to whatever rules set you play
Adventure Planning Brainstorming Tool
Gnome Stew has an interesting form to help you plan gaming adventures. It gives the game master a place to record locales, story goals, adversaries and treasures. It is intended for role playing, but I think it also would be useful for those story-driven miniatures skirmish games.