The imagebox plugin adds a useful feature to images, a box with a caption:
http://www.dokuwiki.org/plugin:imagebox
But with the current Dokuwiki version (2009-12-25c "Lemming") this plugin is broken: It renders the box around the picture but not the caption text.
This is already mentioned on the plugin page but I just wanted to report it here as well where the attention of developers might be higher.