I see that everyone seems to have a gripe about the consistency of the UI. I thought about it for a bit and am gonna play the side of Apple for a minute. Maybe (I have no clue whether this is indeed the case) Apple has left each app different by design. Maybe having all pinstripes in the beginning caused everything too blend in and it was decided a mixture of UI between apps would make it more intuitive. Think of it this way...Expose is nice but it is sometime faster to just click the tiny portion of a window stick from behind of the app you are working with. I commonly have Safari, Mail, iChat, and on occasion iTunes windows open simultaeously. Maybe the differences remain so you can quickly recognise the app because sub-consciously you know that the app is in brushed metal, plastic, subdued pin-stripe. See attachment Without Expose you would not know what is likely the correct window to click on if they are all identical. Look at the image below... I can tell you what each are by the UI style alone...yeah some apps are the same...but its interesting that my 3 common apps each are different...what a coincidence. Maybe in the end this is Apple being fine detailed in making OS X the most intuitive OS. Whether this is really Apple's intent or not, I dont mind it.