The Game I (Currently) Want To Run

A mashed-up collision between Glorantha and certain evocative elements of Steven Erikson's Malazan Empire novels, replete with ancient ruins, savage barbarism and civilized intrigues (also barbaric intrigues and civilized savagery), meaningful religions, technomagical intelligent dinosaurs, demi-gods that walk the land, undead magic cavemen, and clever heroes (and heroines).

The really frightening thing is how little one would actually have to stretch Glorantha as-is to make it work.  Pavis makes a perfect starting point for such a campaign, as it's out there on the edge of the Lunar Empire, surrounded by barbarians in the wastes with the granddaddy of all mega-dungeons (The Big Rubble) right there in the back yard.  Toss in the elements listed above that didn't originate there, throw in a pinch or two of Exalted's Creation, garnish with Stormbringer's demonology, and it would make for one hell of a sandbox.

At least I think it would.