Usability Glossary: http://www.usabilityfirst.com/glossary/

Glossary of Web Usability Terms: http://usability.about.com/od/glossary/Glossary_of_Web_Usability_Terms.htm

User-Centered Design: http://en.wikipedia.org/wiki/User-centered_design

User Experience Design: http://en.wikipedia.org/wiki/User_experience

Interaction Design: http://en.wikipedia.org/wiki/Interaction_design

Flash for Prototyping with Devices: http://blog.mindtribe.com/?p=26

STC Usability & User Experience Community: http://www.stcsig.org/usability/

Contextual inquiry: http://en.wikipedia.org/wiki/Contextual_inquiry

Contextual design: http://en.wikipedia.org/wiki/Contextual_design

RITE usability testing: http://en.wikipedia.org/wiki/RITE_Method

Eye-tracking: http://en.wikipedia.org/wiki/Eye_tracking

Heuristic evaluation: http://www.useit.com/papers/heuristic/ and http://en.wikipedia.org/wiki/Heuristic_evaluation

Card sorting: http://www.boxesandarrows.com/view/card_sorting_a_definitive_guide

Focus groups: http://en.wikipedia.org/wiki/Focus_group

Survey design: http://www.surveysystem.com/sdesign.htm

Net Promoter Score: http://www.netpromoter.com/netpromoter/index.php

A/B testing: http://en.wikipedia.org/wiki/A/B_testing and http://www.useit.com/alertbox/20050815.html

Bill Buxton: http://www.billbuxton.com/

Jakob Nielson: http://www.useit.com

Don Norman: http://www.jnd.org/dn.mss/design_as_comun.html

Andy Budd: http://www.andybudd.com/

Steve Krugg: http://www.sensible.com/

Bill Verplank: http://www.billverplank.com/professional.html