My skirmish game Brink of Battle: Skirmish Gaming through the Ages has a complete and crunchy Campaign system. Models gain Injuries and Experience and can purchase more soldiers, buy new Traits or increase their Ratings after battles. Also has Cavalry and War Dog rules to round out your forces.
We're currently ramping up for the play test of the Fantasy rules called
Epic Heroes.
Part of the play test will be open to the gaming public at large, and you can definitely join us in that.
You can read more about the system at
www.brinkofbattle.com Be sure to pop over to my Figures by Faust blog and the Brink of Battle blog, as well as Anatoli's Game Room to see the battle reports Alex has done so far.
You can use the rules as is to play Fantasy games right now. We did some Period 1 - Ancient/Medieval play testing using our fantasy figures and it worked just fine.
Enjoy!