Okay, I thought it was ridiculous when Microsoft patented emoticons and rss feeds, but this is just silly. According to the article on IT Wire, they've now patented the page up and page down keys.
"For example, if a user is viewing a page starting in a viewing area from the middle of that page and ending at the bottom, a Page Down command will cause the next page to be shown in the viewing area starting at the middle of the next page and ending at the bottom of the next page. Similar behavior occurs when there is more than one column of pages being displayed in a row."
Cue John Cleese: Stop that now! It's just silly!
Either way, it showcases just how broken the patent system in this country has become.