ALEKS math already does the suggestion cloud, in a fashion, anyway - after you go through an initial assessment, it offers a selection of topics you have the foundations to learn next, and you choose which one you want to work on. As each new topic is mastered, it opens up more choices.
That sounds really good...I hate overly rigid sequences. I mean, yeah, you need to know electrodynamics and complex analysis before you tackle quantum field theory, or algebra before calculus, and so in these subjects that have many prerequisites, you'll see a long chain...but for any given subject, often there are multiple paths. I think if I had homeschool from a young age (or at least middle school), then I would be academically much farther than I am now.
