Milind Alvares:

This makes me wonder. Will Lion be the OS that makes all windows and apps inconsistent? iOS so far has sported a myriad number of UI styles, but it works on that platform because when you launch an app, the app takes up the entire screen, thereby being the only UI style you see. But on the desktop, you have free floating windows, and when such non-standard UI presents itself, it can potentially lead to one big mess.

Here is a link to the beta.