I use DokuWiki with the mnml-blog template and BlogTNG plugin as personal blog. Have a look at “How to create a DokuWiki based blog (BlogTNG plugin)” if you want to know more about my setup.

Why DokuWiki? It is very easy to administrate and maintain. IMHO, no other well-known Wiki or CMS provides such a simplicity without missing important features. Additionally, I like the small but nice community behind the software.

— Andreas