Extended warranty is a rip off... You can pay more than the products worth over time... Check your household policy to see if it is covered.. (You will find most warranty won't cover the most important part of a laptop/PC - your data)...
I also respectfully disagree about extended warranties for notebook computers. Even the best notebooks have a 15% failure rate over three years. Such a high rate of failure means that buying an extended warranty is a good idea. An extended warranty for $100-200 is less expensive than having to replace a $500 part down the road.
edit: after reading your most recent post, it seems like you're looking at warranties from an insurance standpoint. The warranties being discussed are offered through the brand, not as a part of an insurance premium. While there is still the consideration of accidents or user-related damage, computer companies can and do regularly recognize and repair faulty or failed components even when the notebook in question has severely depreciated.