Categories should have properties, which are user configurable just like product definitions to allow adding data to categories themselves.
Available in 1.5.
I too would really like to see this implemented ASAP as nearly all of our clients have additional properties on their categories such as meta data, extra pictures or introductory text as Soeren has mentioned.
Soeren, how did you work around this in your install?
This would be extremely nice to have!
I'm especially missing meta properties, such as meta description and page title.