I've been spending the last few days playing around with Blosxom. I've been experimenting with various blogs and wikis and seem to like Blosxom the most. Notice that I didn't mention MT? The reason is that it's for a business and the licensing fee is a bit high for the moment. My personal preferences for the ones I've tried (at least 10 so far) is Blosxom, followed closely by Drupal.
Got any favorites you want to suggest for a *nix-based server?