Wanna Get Sued? Link To Another Site
Need even more evidence that lawyers are ignorant, greedy and the bottom feeders of society? (A rehtorical question) This article on arstechnica will provide you with that information and more.
Federal Lawsuits Take On The Humble Hyperlink
The entire economy of the Internet is based on linking to external websites. Without hyperlinks Google would not exist as part of their search algorithm is based on links coming in to your site and after performing a search on their site they provide links to other sites for you to follow. Social sites like Digg, Yahoo Buzz and even Propeller would also not exist as user submitted stories would have no where to link to.
As is usually the case those with little to no understanding of how something works weather it be technology or something else try and threaten and bully their way into getting what they want. If this is allowed to proceed would the next step be suing the person who gave a stranger directions to a restaurant?