For a few years, I used to research open source Content Management Systems [1] annually. Two years ago I stopped because I finally settled upon Drupal [2]. It's gone from strength to strength ever since and I now use it for most of my sites.
What makes it good? Well, there are plenty of other people writing reviews [3] and telling you how great it is. Here, I'm going to tell you about how you can avoid some of the mistakes I made. In other words, I may sound critical and mention some problem areas, but don't take this the wrong way. I like Drupal. It does what it says on the box and it has served my needs admirably.
Before digging into the details, here's a summary:
I'll fill out more details on each of the above points in my next bulletin.
Links:
[1] http://en.wikipedia.org/wiki/Content_Management_System
[2] http://drupal.org
[3] http://drupal.org/node/13925
[4] http://www.opensourcecms.com/