green lotus, your description made me laugh and nod in equal measures. If hyper visual-spatial DS10 actually wrote paragraphs, I am sure they would look just like what you describe - he's a total PowerPoint addict, and loves to put each word or thought into its own shape/ colour/ font/ direction/ size/ effect.... well, you definitely know what I mean!
We're currently playing with Inspiration, to see if it can help us harness these tendencies for the power of good. It's visual mapping software, that allows you to do all that kind of crazy stuff in a web map - pull in pictures, draw connections, effects, et al - and then with a push of a bottom, it turns the whole bewildering mass into a structured presentation and/ or written document outline.
Too soon to say if it will help DS get to a better written product in the end, but he's enjoying it, and it seems to aimed at making it easy for him to use his strengths (like visual relationships and patterns) and using them to kick start him to the places where he's weak (organized and detailed written output). He should be done his first school-based project using Inspiration in a week or two - I will update if you're interested.
Here's a good video to show what Inspiration does. Two warnings: (1) it's not cheap for what it is (but I found it constantly recommended for serious VS-types with writing challenges). And (2) the fonts look ghastly on my beautiful Mac screen, alas.
www.inspiration.com/themes/inspiration/video-player.php?nid=639
