Yeah. Great. Der Spiegel has an RSS feed. In other words: a . Wow. I'm really thrilled. And of course just one for the headlines. No topic-specific RSS feeds, just one central one for headlines. Brilliant idea. Especially that update interval of 5 minutes. Doesn't sound like they really understood what the point of RSS is. So, dear Spiegel Online editorial team, if you really want to do something innovative, then offer automatically generated RSS feeds for each article category. So people can get their selections the way they want them - not everyone wants to read everything from you.
And as another point, finally offer comment functions on articles, or at least direct reply links, so you can refer to a specific article and the author of that article is addressed directly. Other outlets can do it too...
If you really want to be smart about it, you'd also offer trackbacks. But that's probably asking too much.