Is there a website that can notify me by email about app updates?

I’m looking for a website that can send me an email every time there is an update to a specific app or even the most popular apps for the iPhone/iPod Touch.

I find myself constantly checking the App Store for updates almost once a day (I know a little obsessive). So, it would ease my suffering a little if I could just get updates via email.

Is there such a site? Is there another way to be notified of app updates?