Both Dell and Lenovo offer on-site service where a tech comes to you. It's an upgrade from their "standard" warranty service, but totally worth the extra $, especially if you rely on your computer.

In addition, they both have "accidental damage" with some of the higher-end warranties, so they'll cover you e.g. if you spill soda in your laptop.

More info:

Lenovo: http://www.lenovo.com/services_warranty/US/en/lenovo-warrant...

Dell: http://www.dell.com/content/topics/segtopic.aspx/services/se...