Since the biggest change between MapPoint 2010 and MapPoint 2011 is the updated road data, I zoomed in to random places around the U.S. where I expected to see growth and additional roads and sure enough -- every place I tried had new roads.
This helps with geocoding and routing of course -- if you don't have the road in MapPoint, you couldn't deliver or travel to it in a route! Scroll down to see the comparisons.
Also, all the (unedited) screenshots are attached as a single zip file. If you download and open in something like the default Windows Photo Viewer, that's probably the best way to flip between the images to see the new roads.
Even better, download the trial version of MapPoint 2011 and install side by side with MapPoint 2010 (select Keep Existing Version during the install), open up an instance of both and zoom to your favorite city, and then flip between them. Feel free to add your own screenshots and images as attachments below!