I would like to have a good blogging application developed in Ruby On Rails, or alternative in PHP (I prefer Rails actually, but PHP could work as well).
I know a couple, as Simplelog, but it threw a couple of errors the first time I tried to run it, and once I fixed them, I didn’t like it pretty much.
In Rails Mephisto is widely used blogging engine that has ready-to-use plug-ins and advance feature like built-in caching system for faster loading.
http://www.mephistoblog.com/
If you are looking for some light weight small team oriented, you can easily turn Radiant CMS into blog this also have nice and user friendly futures.
http://radiantcms.org/
And my fav is Typo
It comes with theming & plugins support for easier customization( i like SEO futures )
http://blog.typosphere.org/
I tried and tested all above apps they easy to insatll, configure and short learning curve