From what it looks like, this feature is currently only available in San Francisco and Bay Area (including San Jose), but I’m sure it’s going to be expanded in the future.

It’s a pretty simple use, put in an address and if you see this Street View button, then you can enable the feature. For a sample view, click here to see the awesome Moscone Center.

There’s not much more to say about this right now. Just go ahead and try it out.

Looks like Google hasn’t officially announced this yet as I can’t find anything on their blogs, but it’s live and kicking. Watch either Google’s main blog or Google Maps blog for announcement.

Update: On top of San Francisco, the service is also offered in the following cities: Denver, Las Vegas, Miami and New York.