it's available right now, not sure how long it will be available. ive just been playing with it, very cool where there are high-res textures available, not so when not available. my golf course is available, it looks like those flyovers they do for televised golf tournaments, very cool. i can see golfers, and i think i see myself
http://desktop.google.com/download/earth/index.html
if not available, i'll put it up on waste too, in the Waste Downloads folder....