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One additional note: It is vital that errors is an
assignable attribute of the StreamWriter. 

Consider the XML example: For writing an XML DOM tree one
StreamWriter object is used. When a text node is written,
the error handling has to be set to
codecs.xmlreplace_encode_errors, but inside a comment or
processing instruction replacing unencodable characters with
charrefs is not possible, so here codecs.raise_encode_errors
should be used (or better a custom error handler that raises
an error that says "sorry, you can't have unencodable
characters inside a comment")

BTW, should we continue the discussion in the i18n SIG
mailing list? An email program is much more comfortable than
a HTML textarea! ;)