Actually, I had found Tikiwiki too difficult to install when I tried an earlier version of it. This was when I was looking at Open Source Content Management, as part of a search for greater understanding of Information Architecture.
I first had looked at PhpNuke (Most likely, the best known and most popular, Open Source CMS), the more powerful PostNuke, etc. Eventually, I settled on Drupal because it offers a taxonomy. And, yes, I know that there is more to CMS than categories!
I usually go by ktest on #tikiwiki.
You know you love it.