you're right. amending catalyst::engine to say

            my $u = Catalyst::Request::Upload->new
              (
               size => $upload->{size},
               type => $headers->content_type,
               headers => $headers,
               tempname => $upload->{tempname},
               filename => $upload->{filename},
              );

                                                        use Data::Dump
+er;
                                                        die '$headers:
+'.Dumper($headers).
                                                            'type:'.Du
+mper($headers->content_type).
                                                            '$u:'.Dump
+er($u).
                                                            "\nek!";
[download]

gives

[error] Caught exception in engine "$headers:$VAR1 = bless( {
                 'content-disposition' => 'form-data; name="SourceFile
+_1"; filename="aaa.jpg"',
                 'content-type' => 'image/jpeg; charset=utf-8; Content
+-Transfer-Encoding: binary'
               }, 'HTTP::Headers' );
type:$VAR1 = 'image/jpeg';
$VAR2 = 'charset=utf-8; Content-Transfer-Encoding: binary';
$u:$VAR1 = bless( {
                 'aaa.jpg' => undef,
                 '/tmp/P3v6fH2JR6' => 'filename',
                 'HTTP::Headers=HASH(0x40e9e58)' => 'tempname',
                 'type' => 'image/jpeg',
                 'charset=utf-8; Content-Transfer-Encoding: binary' =>
+ 'headers',
                 'size' => 374205
               }, 'Catalyst::Request::Upload' );

ek! at /Library/Perl/5.8.6/Catalyst/Engine.pm line 556."
[download]

so it looks like $headers->content_type is indeed returning two values. I'll suggest a patch.