According to a report with screenshots 
on AppleInsider, the latest build of Leopard completes the User Interface changes first applied to Mail 2.0 in Tiger.
AppleInsider writer Aiden Malley reports that
The brushed-metal look that first appeared in earnest with Panther has almost completely faded away, according to reports. Well-known holdouts for the style, including Finder, Photo Booth, and Safari, have purportedly abandoned the metallic sheen in favor of the simpler, gradiated style that first appeared in Apple Mail 2.0 and later transferred to Leopard’s version of iChat and the more widely available iTunes 7.
Although the Uno interface hack offers the same unified look across all apps, the Leopard look is slightly darker.
This screenshot shows Spotlight in Tiger with the UNO hack applied in the background, and the new Leopard Spotlight look in the foreground:
Read more at AppleInsider and/or view the screenshots (I am guessing, while you can).
I don’t know if anyone else noticed this, but the new Leopard screens have square windows, is this goodbye to the familiar Mac OS X rounded ones. I hope not!
with UNO Shade u can get the same dark gradient type of finishing. just a reminder :)
Well you where right about ‘while you can’. They are gone already.
Finally. That brushed metal shite looks retarded.
Anyone know if Leopard will include (or if there’s any way I can add to Tiger’s mail) colouring to my Mail folders?
I so desperately want to add a red colour to my “flagged mails” Smart folder.. otherwise I forget to look at flagged emails!