I do love wikis: both in concept and as a tool to keep and organize all of my notes (school and otherwise). My use of wikis in this way makes me particularly attracted to “personal” wikis. These are often more self-contained and easier to install (i.e., no external webserver needed) since they are not designed for public websites.
I liked the overall design of the page, save for the animations (which were a little slow; fortunately you can turn those off) and the colors. Browns and oranges are not my thing, so I changed the css to some dark grays and blues, a screenshot of which is below (click on it to look at the page). If you like my colors, you can install this version by right-clicking on this link, selecting “Save link as…” or “Save target as…” and naming the file what you wish (keeping the .html extension).
For further info on how to use the software, I would suggest checking out the TiddlyWiki site.