1.In previous versions of Windows, selecting multiple files would display their total size in status bar. In Windows 8 this feature has been removed and is being greatly missed.
2.In Windows 7, with classic skins/themes, when your mouse hovers over application icons on taskbar, list of windows (instead of window thumbnails) would be displayed. This has changed in Windows 8, there is no way to turn thumbnails off. Instead of locating needed window by title - you have to look at thumbnails (generated at different scales), which are very not helpful. This feature is also being greatly missed.