It’s a desktop version of Google Maps, but you can save the current view as an image by hitting command-S and enter x2, then dragging the view across and repeat, really quickly and easily getting high-res aerial photos. Then stitch them together in Autostich/Calico or Photoshop.

It saves you screengrabbing tonnes of tiny pictures online because of the keyboard shortcuts and also you save a huge area of the photo. Changed my life. (Mac only, free.)