Rdio for XBMC allows you to play your Rdio music collection through the XBMC media centre.
How Larry Page engineered a beautiful revolution @ The Verge
Cue is a public domain gestural icon system which focuses on legibility and symbolic representation.
Stencils and other official resources for Android developers
UI guidelines for Android devices
The 10 most general principles for user interface design. They are called "heuristics" because they are more in the nature of rules of thumb than specific usability guidelines.
The easiest way to inspect fonts in webpages. Available as a bookmarklet or as browser extension.
Organized by topics provides documentation about extensions, themes, applications, frameworks and technologies.
Anil Dash's principles to deal with UI redesigns without inciting riots.
Gridlover is the tool to establish a type system with modular scale and vertical rhythm to build upon.