Pier CMS, well "next generation wiki" really

Pier is a "next generation wiki" really. It's called a CMS. The
presentation on the home page briefly shows a number of good looking
sites built with Pier.

http://www.piercms.com/

Built on Seaside in Smalltalk. Now with more documentation, supporting
videos, etc.

Any Seaside component is a component that can plug right into Pier.

And it's far easier to build a component in Seaside than any other web
framework.

I tinkered with Seaside a while back, but recently tried it again.
There is a lot more documentation now. Whole books and tutorials on
the web.