It's sort of like a personal blog. However, I use document mode instead of other modes (eg. thread mode), which makes it a personal wiki. The disadvantage of blogs is that people typically don't go back and update older posts to incorporate new information that has been learned since the post was first written.
(some people call wiki+blog mashups a "bliki"... though some people criticize the idea)
1) Myself. To some extent, I treat this as my personal bookmarks folder. It's sort of a mind map.
2) Search engines, and people who visit because of search engines. While most pages on this site are unpolished, there are a few that are highly polished and deserving of broader attention. The "recent changes" style of the frontpage isn't just useful for my own editing, it's also good for Google juice. A lot of random visitors wash up on these shores, look at one page, and leave.
3) Sometimes there are a few individuals who are interested enough to check back periodically, using it as something like Facebook or Twitter — as a way to keep up on what I'm doing at the moment.
I have broad interests, akin to a competent woman. My career is in software engineering, so content tends to skew in that direction.
I'm heavily invested in the hard sciences. However, I'm becoming more interested in social sciences, including semiotics, linguistics, queer theory, history, and epistemology.
Directory pages might look a little unfriendly. The default sort order is most-recently-modified at the top. You can sort by name instead, by clicking on the "name" heading.
Also, I prefer "bare metal" tools. I want to use the traditional grep/xargs/find toolset to manage my content.