I've been trawling around for ideas. I've just received a copy of The King Machine mentioned by @JasonT it is a very interesting system and I would like to try a game but I don't think that will happen.
I've also been looking at diceless games because I have an interest in systems. I found this page http://www.dyasdesigns.com/roleplay/dicelessgames.html and I have been playing with adapting some of the attention points mechanism from The Delta System for use with our current GURPS games and its mob of attention deficit Ellyon.
I've noted the link to Royal Blood provided by @Felicity, I think I will have to buy a copy just to see what it is like. In the past I have used tarot cards to create instant scenarios but this also looks interesting.