UseIt

No mention of user interface design would be complete without pointing to Jakob Nielsen’s website. A great many interesting articles here on many design issues.

The link address is:
http://www.useit.com/

If you can read this text, it means you are not experiencing the Plone design at its best. Plone makes heavy use of CSS, which means it is accessible to any internet browser, but the design needs a standards-compliant browser to look like we intended it. Just so you know ;)