Drunkenbatman’s interview with Wil Shipley of delicios monster is ripe with great sound bites but my favorite part is where he talks about the implementation of barcode scanning functionality in delicious library:
Humans are incredibly good at trying new and random things when they get instant feedback. It’s the basis of all learning for us, and it’s an absolutely fundamental rule of UI design.
Don’t miss “the art of delicious library” at the end of the interview, a pdf showing the user interface in various stages of development. Though i’m not a huge fan of the final interface (ever heard of human interface guidelines?) it’s nonetheless interesting to see the ui evolve over time.