I recently acquired a new desktop with Windows 7 installed on it. There are a number of new features in Windows 7, but here I'm going to list a few that I find absolutely awesome. Some of these features might not be exclusively new to 7, but as a took a pass on Vista, I'll list them here anyway.
Snap!An awesome feature of Windows 7 is the ability to drag a window to the screen edge and it will “snap” into place. So if you drag the window to the left or right side of the screen, it will resize to fill one half of the screen. This is great if you want to view to windows side-by-side to compare them or work in both simultaneously.
In addition, you can also drag the window to the top of the screen to maximize it. Drag it again and it is restored to its original size. You can also grab the top or bottom border of a Window and drag it to the corresponding screen edge. When you do, the opposite edge will automatically move to fill the entire height of the screen.
Finally, you can also use the WIN+ARROW KEY to have the same effect. In fact, using the keyboard, you can actually move snapped windows across multiple monitors. You can also maximize the window by using WIN+UP ARROW or minimize with WIN+DOWN ARROW. Manually resizing windows is a thing of the past!