Been playing with Google Earth a bit, and boy, is it cool. You need a bit of a good computer and Windows to run it, though, unfortunately. In the mean time, here's a nifty quicksearch bookmark for Google Maps, the slightly less impressive but still damn slick web version of the product formerly known as Keyhole.
http://maps.google.com/maps?t=k&q=%s
Make a bookmark with the above linked to a keyword like 'map' or something equally useful, and you can type Google Maps queries directly into your location box. Particularly useful for lat-long coordinates. Now, how long will it take GeoURL to integrate a "display google satellite map" link into their pages... Or a greasemonkey script, perhaps.