Well, this is a complicated one.
First of all, I'm having difficulty looking past the current set of answers. They are almost all worthless... "Hey, X is a system that doesn't use dice! Here's the theme of the system!" The only one that even begins to talk about the mechanics is your GUMSHOE answer, and even that one doesn't go into a great deal of depth on the mechanics.
What would this question look like in a traditional format?
What makes a good diceless mechanic; what pitfalls do I need to avoid when using a diceless mechanic?
<description of game design situation>, what would be a good diceless mechanic to use?
<sys-rec>: I'd like to play a game without dice, which one should I try?
So what about community wiki?
If we're listing systems that have diceless resolution mechanics, then no. It should be closed, or brought into line with the system-rec tag.
If we're trying to get a list of actual, diceless, resolution mechanics, as a designers resource, I can get behind that. But all of the current answers need to be removed, or dramatically expanded on. Even the GUMSHOE answer could use some expansion on how the mechanic works, and what the benefits of it are.
The questions with Community Wiki are "what are we saying with it" and "where do we draw the line." Is this something that the community wants to groom and maintain? Does it add value in that form? What is the threshold for list questions, if this one gets through? What separates this one from all the rest?