I am a bit addicted to Google Earth, actually it is helpful at times especially the street views when you are headed somewhere for the first time, or sometimes just to get a different perspective on different places you have been.  Google Earth also has historical imagery allowing you to see not only the current published image, but previous ones as well.
A while ago I was playing with historical imagery and captured these images of the Swan and Dolphin taken between February 1994, and May 2010. Â You can also see how Google Earth imagery has improved over time.
[flickr-gallery mode=”photoset” photoset=”72157625748961365″]
Click on each photo for a larger view or visit the entire set on Flickr.