My iMac 24" has just arrived. I ordered it weeks ago, and it seems to have taken an age to be built, shipped, and arrive.
I'm happy to say it's perfect. It's got a tremendous amount of WOW factor. Surprisingly for a display this large, there are no dead pixels. Unless you've seen one in the flesh, it's difficult to describe how big it feels, but it makes the 17" iMac I was given by Apple (for being an Apple Transition Kit developer) positively tiny. The sheer size of the screen is impressive, and it's bright and clear throughout.
Also arrived at the same time is the new White MacBook, and all I can say about that is 'gosh this is cute'. I'm typing on it right now, and I can see that it will already be a popular little addition to the toolkit. Best of all, the little screen is incredibly bright (I'm currently using it in a well lit room with the brightness on the lowest setting before the backlight goes off) and, considering the reduction in size and real estate, surprisingly useful.