A First Look at Safari 4
SitePoint gives an overview of the newest Safari browser.

50 Twitter Tools and Tutorials For Designers and Developers

DWWS 3e
Jeffrey Zeldman is working on a 3rd edition of his excellent book, Designing With Web Standards. Some discussion and requests on material to be covered. Want!

New Spring Design
Matt Mullenweg has a new site design. Impressive!

The Mockery: An Independent Mock Object and Stub Framework for PHP5