I've been using Windows 7 since the Release Candidate dropped two weeks ago and I must say, this may be Microsoft's biggest game changing release since Windows 95. Granted, its not that different from Vista, it certainly borrowed a number of concepts from OS X and perhaps some some from Linux, but that doesn't matter. What matters is that Microsoft has finally released an OS that doesn't force the user to adapt to the OS, because Microsoft actually seems to have listened to what the users want.
While multiple monitor support isn't where it should, Windows 7 adds some handy features. Before Win7, in order to move a maximized window from my left monitor to my right one, I needed to double click the title bar to unmaximize it, grab the title bar, drag it to my other monitor, and then double click the title bar to maximize it again. This may not seem like a lot, but remember, all I wanted to do was move a window from one monitor to another. This process took five clicks. In Win7, all I have to do is grab the title bar, drag it to the other screen, and touch the title bar to the top of the screen. Now, its a one click process.
Similarly to moving windows accross monitors, Microsoft added some other windowing shortcuts. If one double clicks on the upper or lower border of a window (the part of the window that allows one to resize it, not the title bar or status bar), the window expands vertically to fill the screen but maintains width. If one drags a title bar to the edge of the monitor, the window is resized to fill the corresponding half the monitor. This is useful on widescreens as they are designed to fit two full documents on screen.
I did a Windows Update with an unsaved Excel file open. When the Update completed, my computer rebooted. Assuming my work had been lost, I felt my typical anger at Windows Update that always seems to ensue shortly after I discover my computer has been automatically rebooted. When my computer came back online, however, Windows opened my Excel file as if the computer had never shutdown.
The Recent Items list that used to be a single entry in the Start Menu has now been distributed across all of the related programs. Any program that appears in the Start Menu's recent programs list now has an asosciated list of recent files.
I am mildly disappointed that Microsoft removed one of the changes they made in Vista: "Documents" is once again named "My Documents". Not a big deal, but I don't like the fact that half of the folder in my home folder start with "My".
Every day that I use Win7, I seem to find new features that make me even more impressed. As I discover things, I'll post them here.