So yes, I reckon a personal wiki is a modern-day Zibaldone, and I recommend trying one out.
I've been considering doing the same.
1. I could go back in time and jump directly to the solution of something that I knew I had solved but couldn't remember how.
2. It was used by my employers to save in case a patent case arose and they had to find evidence pointing to engineers working on a particular idea. For that reason, the notebook had to have sequential numbered pages, entries had to be dated and binding had to be sewn (to decrease the likelyhood of tampering).
I tried to use a simple Markdown-based folder structure, but it just was too unwieldy for my tastes.
What I'd like is some sort of Google Now integration with org mode so I can take notes verbally or quickly with my phone, then revisit them in org-mode later.
I've rather enjoyed it, though one downside is that it's only 80% portable for me. as in I can't really be bothered to use it with my phone and using it while hiking is a no-go for obvious reasons.
All well and good, that's why I keep Field Notes around for.