Senior product manager offers a great inside look into the many improvements in CS4.
“I’m a perfectionist, and I deeply, viscerally want to smooth & polish every aspect of Photoshop.  Doing it all in any one cycle is impossible, but I’m proud to say we’ve put a ton of effort into sweating the details in CS4.
You’re going to see tons of flashier features in other write-ups, and of course I’ll cover them here, but for this cycle I want to lead with the little stuff–things you might not read about otherwise, but which can make a big difference while working.”
Read his extensive list of advances in CS4 here.