use Tie::RefHash;
use HTTP::Request;
use Data::Dumper;

$r1 = HTTP::Request->new(GET => 'http://www.perlmonks.org/');
$r2 = HTTP::Request->new(GET => 'http://use.perl.org/');
# Etc...

tie %sites, 'Tie::RefHash', ($r1, 'Solo', $r2, 'Solo');

print Dumper(\%sites);