One of the little annoyances I had with Vista was that it was a little harder to get into the Display Settings than it had been in Windows XP. In XP, you simply right clicked the desktop and then clicked Properties and you were into a dialogue that included a settings tab. In Vista you need to right click the desktop and select personalize. From the resulting dialogue includes a link that will launch the display settings dialogue.
The problem with the Vista approach is that I found that the Display Settings is the bit I want to get to far more frequently than the other items in the Personalize dialogue, but it is a layer deeper than it was in XP.
In the Milestone 3 build of Windows 7 I was pleased to see that the display settings had been promoted. Right clicking on the desktop launches a context menu that includes a Display Settings item as well as the Vista style Personalize option.

The next pleasant surprise came when I clicked that link and found that the Display Settings dialogue has had a bit of an overhaul.
Each monitor (when there are multiple monitors attached) has a meaningful label so that it is pretty easy to figure out which is which.
For each monitor it also detects the native resolution of the and shows (recommended) next to that resolution. There is also a handy tip shown to tell you about the keyboard shortcut that helps you connect a projector, which I found by accident and blogged about previously.
There seem to be a few handy little tips like this scattered through Windows 7 and I am betting that there will be a few more in the final version. These hints are going to make some of the "power user" features more discoverable and therefore more widely used. This can only be a good thing.