Mobile Stew

Wow, Google really don't like their listings being 'abused'.  Google discovered that BMW Germany had been using 'Doorway Pages', pages which are stuffed full of keywords that thesite feels a need to be optimized for; however, as opposed to realpages, this doorway is only displayed to the Googlebot. Human visitorswill be immediately redirected to another page upon visit.

When Google discovered this they reduced BMW.de's Page Rank down to 0, which means that no BMW.de pages will appear near the top of listings.

I wonder sometimes though, whether Google is playing fair in all this.  When is a SEO technique acceptable?  The aim of all SEO is to get higher rankings - I don't think that banning people because you don't like some SEO methods, but then ...