Eribium has been out for a very short time--as of this writing there have been under 250 downloads, but already looks like a promising option as a CMS for fairly simple websites. In general, Eribium can create pages based on a global template and handles uploads and file attachements nicely.

Where Eribium really shines are in the design--it's very polished, the admin looks great and the default themes (ported from Typo) are also very nice. It also does a really good job with the details. Check out the screenshots attached to this article for some visuals, but to list them, some of the coolest parts of Eribium are:

• Spell check - a la Gmail. Inline, preconfigured and very nice.
• Good control over feeds
• Have I mentioned it looks good yet? Well, it does.
• Tagging
• Nice use of Ajax in a few key areas.

The installation was painless. On a server that was already running Rails 1.1 it took me less than five minutes from start to finish to get it running. The steps are (like most Ruby on Rails applications) download, extract, create empty database, run rake migrate and you're done.

If you're looking for a powerful CMS, this probably isn't the best choice yet, but for a simple site Eribium is worth a look.