Er, not really. I mean, it works in that it tells you when a new comic/newspost is up -- which is, after all, its primary function.
But ideally, an RSS should point to the posts it tells you about, not just send you to the same URL every time (ie, new comic notificatiosn should got to the comic, not the main page). Brion, if you send me the PHP I'll see if I can send back a better working version.