There is a lot to like. If you are interested in this stuff, definitely check out the videos.
Things I liked about the new Taskbar:
- Quick Launch Bar, Running App's, Application Notification, Toolbars (like Windows Media Player) all integrated into a single UI with large icons
- Can rearrange order of icons
- Jump Lists: without opening an app, you can pick the recent files or perform common tasks (like continue a playlist in Media Player)
- When you hover on an app that is running, you get thumbnails of *all* the open documents for that app (not just one like Vista). If the app uses tabs (like web browsers), you can see complete views of each tab (see above photo of 3 tabs of IE).
- Peek: When you mouse over one of the thumbnails, the actual window on your desktop becomes visible and all other windows fade away. This is better than other app switchers because the size and location of the app are unchanged and thus more quickly identifiable.
- Thumbnails can have custom controls. For example, Media Player has play/fast forward/rewind buttons that you can press without switching to Media player (replaces functionality of the Media Player Toolbar)
- App's can change their Icons for notification. For example, prior to Windows 7, Outlook used a notification icon in the bottom right to indicate a new mail message. With Windows 7, the Outlook icon for the running app can show the new mail icon.
- Windows 7 icons are larger than Vista icons, yet take up less space because no text is shown.
- Progress bars are integrated into the app icon...no need to keep track of an extra window dedicated to a progress bar
- No "classic" Taskbar...this *will* be the Taskbar for Windows 7
Things I like about the new Explorer:
- Search (in the upper-right corner) still uses properties (like "tag:SIGGRAPH" or "name:*.jpg"). Most people don't know about using properties for search. With Windows 7, a *super* slick UI helps you choose properties and shows you how to type the search directly as text (see the demo video for picking a date range)
- Libraries: Libraries are a collection of locations with a common data type. For example, if you add a 2nd hard drive for video storage, you just add the 2nd hard drive to the "Video Library" and both hard drives appear as one in Explorer's views of the video library and search results. Libraries looks like the way Windows will move away from drive letters finally.
- Search results highlight the matching content (both in filename or file contents).
- Order of search results is more logical with filename matches before file content matches.
PDC has a *ton* of information on upcoming software from Microsoft and all of the presentations are available online here.