UI resources
Leo's Icon Archive
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Free icon site.
Cool Archive
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Free icon site.
Articles and Journals
Interface Hall of Shame
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Hall of Shame, perspectives on UI design, from Pixelcentric.net.
Interface Hall of Shame
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By Isys Information Architects.
Andy Tai's list of free GUI toolkits
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Very handy list
Portable GUI FAQ
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Brad Myers' Tool List
- No longer maintained.
Miscellaneous resources
XPMCOM
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Portable, free implementation of COM