Erick Wujcik, sadly, has passed away. In addition to his other Palladium Press RPG contributions, he created "Amber" a diceless RPG. I have yet to actually see this, but I'm very intrigued. Wikipedia has an entry about it. A fan has created a number of links of interest.
The idea of a diceless rpg system really makes me think that the game must be much more based on actual roleplay as combat and randomness/luck wouldn't be as important. It must be even more than usually based on real collaborative/improvisational storytelling. I thought I read somewhere that the game may be reprinted in the near future, but right now it's available as a PDF download at DriveThroughRPG.com.