Googled launched this today - check it out
Not all areas are covered (yet) but most of the major cities in the US are on the database. Ditto Australia.
I'm not sure what I think about a lovely pic of my house taken from the street is available to anyone who has my postal address. I'm not a privacy freak at all but I'm a bit uncomfortable with this one. On the other hand I don't mind the aerial view on Google Earth so OK, I'm being inconsistant.
If your home is on Google Street View - do you care?