Florian Mueller with the easiest to understand of all the patent discussions about the cards that Apple is actually holding:
And with several such patents, it’s possible for Apple to create a very serious user experience gap between its own products and those of its competitors.
Death by a thousand cuts. Well, it won’t literally take a thousand patents. But the key thing is: one such patent has an effect, and several of them can collectively have major impact.
If you are at all curious as to why Google is so worried, this is the article to read.