jquery-lightbox-0.5 is cool.
dowmload: http://leandrovieira.com/projects/jquery/lightbox/
Geeklog site
http://www.geeklog.jp/article.php/databox_20100801
It has been decided that jQuery will be the library Geeklog uses.
I am not sure if it will be implemented directly into Geeklog or as a plugin. If it is as a plugin I would like to see the feature on Plugin Version Control and Dependencies