I'm struggling through some utf-8 issues myself, and the best explanation I found (since I found the perl docu overwhelming) was at Unicode-processing issues in Perl and how to cope with it
The general strategy this page suggests for dealing with unicode in perl 5.8 is
$_ = Encode::decode_utf8( $_ );
This was for a cgi context, but it seems to me it should be applicable to all input from wherever. I suspect, but am not certain, this is doing the same thing, or something similar, to what corion suggested.
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