I was alerted to this site on another forum. It's apparently unauthorised, but it enables you to compare images from Google Maps and other satellite imaging sites and, best of all, you can create a link to a location and email it - excellent for showing potential guests exactly where your property is, e.g:
flashearth.com/?lat=36.356803&lon=-5.235493&z=17.5&r=0&src=ggl
It appears to resolve quicker than Google Maps and you can go to a location (in the UK and USA at least, I'm not sure about other countries) by searching for a post code.