I've driven down Lombard St, San Francisco four times. More accurately, I've been a passenger three times, and the driver once. But now, with Google's new street view addon to Google Maps, anyone can do it!
So far just San Francisco, Denver, Las Vegas, New York and Miami appear to have street view flythroughs.
GeoTrotter
I added all the best "Google Street View" here : http://www.geo-trotter.com/cat-street-view.php.
Missy
Lombard St. is wild! I've also gone down it both my trips to San Fran.
I'll have to check out this new Google feature. Thanks for sharing.