What's the big deal? I'd really like to know too. I'm not just asking that to be snarky. :-)
AWS and a few other hosts[1] have had this for a while. Is Linode doing anything differently, or is this just an instance of another (big name) hosting company joining the fray?
[1] like contegix: http://www.contegix.com/infrastructure/load-balancing.php