It's interesting to read the other reviews. I agree with one thing : the current level of functionality is very simple, even basic. Coda doesn't do much at the moment, however I also agree with another point : the UI is nice. More than that, I can see how it could become a very good tool if the owner takes it to the next level, because the approach paves the way for some transversal thinking.
I listed a few questions (see Questions tab) and Nick answered by telling me most were on the short term roadmap. That's nice.
However at the moment, most mind mapping tools (mindmeister, simplemind, mindmanager to name a few) can do what Poda does but they also do much more. There are even diagram drawing tools that can do the same or better.
So the current taco rating should be a 3 at best but I give it a 4 because I have a feeling it can become something. Let's see what it becomes in the future.