Played around with OmniGraffle recently while mapping out site architecture at work. What a nice piece of software, making it so simple to create flowcharts and diagrammed layouts, drag and drop shapes, add text, etc. Also impressive is the interface design.
January 19, 2003
CSS3 For Web Designers Paperback + eBook A Book Apart
Bulletproof Web Design Third Edition New Riders 
Handcrafted CSS Book and DVD New Riders 
Web Standards Solutions Special Edition Friends of Ed 
Dribbble What are you working on? 
Instapaper Icon design