Interaction Design Foundation

http://www.interaction-design.org/
A great resource for the field of interaction design, with contributors from top universities and companies such as Stanford, MIT, Google, Yahoo and IBM. Some of its mission objectives are to provide free and open access to top-grade educational materials on how to design technology and to educate technology designers on how to make more people-oriented and easy-to-use technology - like websites, household appliances, software applications, and mobile devices.