Wow, that's an amazing system!
I don't know of anything offhand that's like that anywhere, for anything. The closest thing I can think of is the chapter exercise sets in The Art of Electronics which are treated separately in the student guide. I wonder if the larger electronics community (including the newsgroup folks, for example) would participate and support a similar venture.
A close second would be answering questions on forums, anywhere you can find them. If you wander back through my post history you'd see a lot of, "I'm just guessing, but this might help" and "I'm not sure, but these links might get you closer." I'm new to the vast majority of electronics and by researching the problems people post about I learn a great deal about a broad range of things. I've also been blessed/cursed with abundant free time, so I can leverage that into research that anyone with a normal-ish life wouldn't have the time to do. It works well for me, I just have to remember to lay on the disclaimers thickly so nobody mistakes my advice as certainty gained from real experience. No complaints so far.