I'm pretty new to CC3, having only created a couple of maps so far. Note that I've also never used a previous version of the software, so I hope I'm your target audience.

My main interest is in dungeon design (DD3), so my suggestions may be biased in that direction. I've figured most of this stuff out on my own, but it would have been *really* nice to have had the answers in a nice convenient book. Still, here are a few documentation suggestions:

1) How does one inspect the properties of an element on the map?

2) How does one work with symbol catalogs? What's the deal with the "master filter" thingie, and how does it impact which symbols you see? (A particularly useful question after you install the additional Symbol Sets).

3) How does one adjust and manipulate the grid, particularly when we intend to print or display the map as a battlemap?

4) Creating symbols of one's own... I know you've already got this one, but I'd like to suggest covering areas such as: making symbols "smart" (and what exactly that means, and how "smart" symbols work), and what the implications of putting them in certain or sheets layers are.

5) How are the default settings for layers and sheets intended to be used? Meaning - why do things work the way they do out-of-the-box, and why would you want to change them.

Other than these, it's probably a good idea to wade through these and other forums looking for "how do I..." questions, but I suspect you've already done that.

One other thing you might want to do is add a section on techniques. For example, I've used some CAD software before, so I learned pretty quickly that it's a better idea to sketch my maps on paper ahead of time. Now, some people may disagree with me (I am a newbie after all), but I have a hard time believing that CC3 is design software. A buddy of mine who's also using CC3 for the first time (and is a former Dundjinni user) kept butting heads with the software trying to move things and around and make major changes in the middle of map before I suggested doing pre-design on graph paper.

Okay, that's my $0.02... hope at least some of this is helpful.

And, good luck on your noble quest! I'm looking forward to reading what you come up with.