There's actually something kind of like this available now, called EBt. It's described as a 'link memo' software, written in ruby. It seems to be really popular. The only problem is that it is only available in Japanese.
Wow, wasn't aware of this software.
Seems to be quite good, though I wonder if you can give me a start.
I speak Japanese but am at a loss as how you use it. I just tried a couple of keytaps, edited some notes, now I have a strange structure of links within links, and so, wow... How do you actually work with this?