Why not Evernote (etc.)?
- Not public.
- Doesn't have links between pages. Links work pretty well on the web. Links match how we put things together in our own head: they allow more complex organisation of information.
- No (sane) collaborative options. A personal wiki that's on the web can be selectively open to allow collaboration from others on particular pages.
Problems with other personal wikis
- Solutions like VoodoPad are tied to particular OSes (Mac OS X, iOS). The web browser is universal.
- Some personal wiki systems don't have version control and/or store data in binary blobs. The latter prevents the use of Git/SVN etc. for effective version control. MediaWiki has it built in.