Thanks Fred! I don't know why I didn't think to check with Google myself, but I did, and found out that they do allow use of their products (including screencap photos), provided that you acknowledge them as the source. The specific statement from Google reads, "For screenshots, the Google or Google Maps logo is not required but attribution must always be present. However, the reverse is not allowed - only including the Google logo is not proper attribution, particularly when 3rd-party suppliers were used for the content." In other words, if you intend to use a screen-captured Google Earth aerial photograph or a Street View photo of someone's current or former residence, the comments entry for your photo should include "© Google 2012", regardless of whether the Google Logo appears on the photo or not. Hope that helps anyone who might have been wondering about this!
