Hello,
 
With Zope 2.8.7 and Python 2.3.5 (Plone 2.1.3 installer), when I search inside the ZMI for the spanish " ñ" character (inside a Plone site object), I get an UnicodeDecodeError:
 

Site Error

An error was encountered while publishing this resource.

UnicodeDecodeError

Sorry, a site error occurred.

Traceback (innermost last):

UnicodeDecodeError: 'ascii' codec can't decode byte 0xf1 in position 0: ordinal not in range(128) (Also, the following error occurred while attempting to render the standard error message, please see the event log for full details: 'portlet_intranet')