Patterns

It dawned on me that patterns seem to be a core "go to" of mine, but I've never stepped back and listed the main places I've either been or currently hang out. This list is more of a bookmark list for me, but feel free to browse and let me know if these are useful or you have any others...

GUI Patterns
Jennifer Tidwell's Design Interfaces (aka Time-Tripper for us older folks) http://designinginterfaces.com/ One of the first folks that took idea of design patterns and applied to UI's (over a decade ago). Original site eventually became her book.
UI Patterns.com Library - http://ui-patterns.com/
Welie Patterns - http://www.welie.com/patterns/ Was #2 on my goto list for a long time
Interaction Patterns - http://www.cs.helsinki.fi/u/salaakso/patterns/
Yahoo Design Pattern Library - http://developer.yahoo.com/ypatterns/ Growing, fresh, active community is building around this site.

General Software and Patterns Thinking
Gamma, et al (Elements of Reusable OO Software) - http://www.tml.tkk.fi/~pnr/GoF-models/html/ (just the diagrams, but if you throw a rock in your cube farm, you'll probably hit someone that has the book)
J2EE Patterns Catalog - http://java.sun.com/blueprints/patterns/catalog.html
and browsable diagram http://java.sun.com/blueprints/corej2eepatterns/Patterns/index.html
Martin Fowler GUI Architectures: http://martinfowler.com/eaaDev/uiArchs.html
Martin Fowler Enterprise Patterns: http://martinfowler.com/eaaDev/