Fine, but it's not indended, and clearly stated not to be intended to do so at this stage. You can't expect a beta software to be the successor to your current OS.
taken from apple and various linux guis, no doubt...
Hmm, live previews, well the dock has some of them, but alt+tab in OS X doesn't, Windows does that better, and the taskbar scrolling doesn't. Flip 3D is just like Expose on OS X, just that you can scroll via the keyboard, I'll give you that one. Sidebar belongs to no one really, widgets have been out there a long time, and Apple technically took them from Konfabulator, to me, this isn't copying, it's competetion to use the good things to make a product better, and I have no problem with it. Sidebar behaves differently from any other Widget engine also. Aeroglass, again, that's just GUIs and thats being innovative, and making it better. Apple and linux have their shares of coppied features from Windows too.