Links to various sites about User Inteface design and experiences:

• UI-patterns.com

  http://ui-patterns.com
  Great collection of web patterns. Also focused on bridging theory with practice (tutorials)

• Martijn Welie: Patterns in Interaction Design

  http://www.welie.com/patterns/
  Martijn was one of the first practitioners to start a collection. He welcomes input.

• Yahoo! Design Pattern Library

  http://developer.yahoo.com/ypatterns/index.php
  Growing list of well-documented patterns.

• Web Patterns: A UC Berkeley Resource for Building User Interfaces

  http://harbinger.sims.berkeley.edu/ui_designpatterns/webpatterns2/webpatterns/home.php
  Short but well-documented list.

• About the Book - Designing Interfaces

  http://designinginterfaces.com/
  Long list of useful patterns.

• uiGarden.net - Innovative UI Design

  http://www.uigarden.net/english/innovative-user-interface-design
  Slider, fisheye, tree menu, and drag and drop are featured.

• Design Pattern Collection on Flickr

  http://www.flickr.com/photos/factoryjoe/collections/72157600001823120/
  Many screenshots of common design patterns, including alerts, tagging, login, tabs, uploads, and more.

• Wikipatterns - Wiki Patterns

  http://www.wikipatterns.com/display/wikipatterns/Wikipatterns
  Purely Wiki-related, more about usability than UI.

• WebPatterns

  http://webpatterns.org/
  About patterns, ps, blog, and upcoming wiki.

• Hypermedia Design Patterns Repository - Univ. of Italian Switzerland

  http://www.designpattern.lu.unisi.ch/PatternsRepository/BrowsePattern.htm
  Less complete treatment, but contains a few thought-provoking patterns.

• Web 2.0: A Pattern Library

  http://www.webmonkey.com/06/12/index4a.html
  Brief treatment of several "Web 2.0"patterns.

• Faceted Metadata Search

  http://www.searchtools.com/info/faceted-metadata.html
  Several approaches to searching within multi-faceted information.

• Web Design Practices

  http://www.webdesignpractices.com/index.html
  Several common navigation and layout approaches, with statistics on frequency.

• Max Kiesler - designDemo

  http://www.maxkiesler.com/index.php/designdemo/
  Many "web 2.0" demos; some original, some ps.

• SAP Design Guild -- Fighting (with) Hierarchies

  http://www.sapdesignguild.org/community/design/hierarchies2.asp
  Guidelines on how and when to use various hierarchy presentation types.

• Dynamic Help in Web Forms :: UXmatters

  http://www.uxmatters.com/MT/archives/000191.php
  Several approaches for providing assistance with forms.

• Design Meltdown

  http://www.designmeltdown.com/
  Graphic design patterns, as well as some web design patterns.