Radiant (http://radiantcms.org/ http://radiantcms.org/) is very popular. If you want something more lightweight, I've just started using blogcast http://techoct

Radiant (http://radiantcms.org/ http://radiantcms.org/) is very popular. If you want something more lightweight, I've just started using blogcast http://techoctave.com/blogcast/ http://techoctave.com/blogcast/ which is a great rails based blogging engine. If you really want to learn Rails though, write your own CMS with it!