Personal wikis are wikis that are run entirely by a single person, hence ‘personal’. The wiki you are currently on is a personal wiki - shocking, I can imagine.
They’re similar to blogs, but the key difference is that blogs tend to be chronologically linear^A), while personal wikis are chronologically non-linear^B). Personal Wikis would suit pirates extremely well, as far as organization of content…on the other hand, it may make it easier for authorities to shut them down…somehow.

• Nameless Rumia's Wiki
• Compendium of Personal Ignorance
• EKsK - Everything Killsushi Knows^C)

• Everything Shii Knows - Run by Shii, arguably started the whole personal wiki craze^D). I only include it in this list due to that fact.
• World2ch Historical Society (Archive) - Run by 0037, the only dead personal wiki I bothered to go through. Has info on the early days of 4chan and the days preceding 4chan. The archive is maintained by killsushi^E).

I had initially been planning to use MediaWiki for this wiki, but it turned out to be far more complicated to install than I previously anticipated. Consequently, I don’t recommend MediaWiki for personal wikis.
Instead, DokuWiki is the better option for a personal wiki and it’s what I’m currently using. I like DokuWiki so much that I recommend it to people for other web-based purposes.
If you don’t want other people to see your personal wiki^F), or you want to build up the wiki before publishing online, then it’s best to use DokuWiki on a stick or WikidPad. Dokuwiki on a stick can easily be migrated to a Dokuwiki installation.
If you’re a writer, and you’re primarily interested in organizational software, then I’d personally recommend Scrivener. It’s commercial software, but the price is definitely worth it. I use it to help me organize my writing material^G).

A while ago, I noted that there appeared to be a clear differentiation between the tones and presentation of personal wikis, although I haven’t looked into it any further than ‘I noticed something!'
From what I’ve observed, there are two main ‘families’ of personal wiki, where each descend from one of the first ones - Shii and 0037’s wikis.
The wikis derived from Shii’s tend to be more formal, they cite sources more often, and generally present themselves in an encyclopedic manner^H). Those derived from 0037 tend to use cruder language, are generally looser in tone, have less sources, and are generally more ‘blog-like’^I;J).
I did notice a little later, however, that personal wikis don’t neatly fall into one or the other. My own wiki has undergone a significant change^K).
Nowadays, I actually think that this classification doesn’t work the way it did before. There are very few personal wikis around, and they appear to take little inspiration from the dead ones. In my case, I see myself as separate from the rest, so the classification doesn’t make sense. Another issue is that I really don’t read many personal wikis, and those I do I read rarely, so whether this realistically applies is unlikely.
I am noting this in the event someone wants to look further into it, perhaps they’ll find something, or maybe they won’t.