I'm totally new to corona, so I often would like to read a bit in depth about how things work.
Especially the node materials.
Maybe you know cycles4d from insydium, I used this a while but I don't like my GPU to act like an Antonov AN-22.
But, the help system of cycles4d is really outstanding great, its a combo of text+video, you can right-click nearly anything in cycles to go to that specific help section.
I would love to see something like that in corona :-)