There's a great article on Digital Web Magazine called APIs and Mashups For The Rest Of Us by Gareth Rushgrove. The article explains what an API is and how websites uses these extensively nowadays. Mashups are described and the use of microformats as an API is explained [see also Can Your Website be Your API?].
I'm already looking forward to part 2 of APIs and Mashups For The Rest Of Us.
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Flexible Web Design by Zoe Mickley Gillenwater describes how to build fluid and elastic CSS layouts. It's a great read!
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