> wordpress blog:: easy to use, full of features which can be easily installed by a novice computer user. A huge development stream of offerings with it. My #1 choice.
> joomla 1.5:: requires a period of time to learn, all based on the amount of knowledge you can cram into ur brain. I'd reccomend this too experts and professionals looking too oneday manage a large volume of online content and user base. It's very well done overall and does best when paired with a team of pros.... the skys the limit.
> mediawiki:: simply the wikipedia.com platform. I love the functionality of these types of websites, and they are becoming more cms focused as well. What else would you need if you're looking too offer a resource where others can learn from your company, business, or products? Really every website should have one of these, super easy to run and maintain, a no-brainer choice.
> drupal:: drupal has got it going on, very easy to use, solid as frozen rock, lots of pluggable features, and flexibility. If you chose drupal as your cms you won't go wrong.