Sorry to hijack the thread, but I have certainly experienced this with my own P&S cameras, and now that I use a DSLR I've really appreciated that it doesn't have a delay.
Does anyone here know why?
Is it because the P&S uses the image sensor for focusing rather than a dedicated focus sensor? Are the motors in the DSLR just that much faster? Both types of camera use the same 'contrast' mechanism, don't they?