My company is relocating some servers today, and one of the coworkers asked if I knew of a link spider that he could use to quickly check for (4|5)xx error codes to make sure things are working. Rather than spend minutes searching the web for one, I reinvented the wheel in 30 seconds. In fact, it's taken me longer to put together this node!!! 
#!/usr/bin/perl
use strict;
use LWP::UserAgent;

my @list = qw(
http://www.yahoo.com
http://w1.dev.chaffee.com
http://foo.bar
);

my $ua = LWP::UserAgent->new();
$ua->timeout(10);
for (@list) {
    my $r = $ua->get($_);
    print "Try $_\n";
    if ($r->code =~ /^(4|5).+/) {
        print "\n\nError with $_: ".$r->code.": ".$r->message.$/.$/;
    }
}

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In reply to Reinventing the wheel by bageler

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