See the world?  The Top Streetview websites will let you do that with their own style of 360 degree tourism.  Using Streetview you can actually roam around before you actually get there.  With multiple websites trying to map out the earth, we might just soon have streetviews of almost everywhere!

MapJack
Mapjack covers SanFrancisco, Sausalito, and Chiang Mai, Thailand.  Though MapJack still uses Google Maps, their 3d navigation seems the easiest to use.

EveryScape
What makes this site stand out is the fact that you can actually roam around within bars and clubs.  You can even see inside a nightclub in Miami.  You can also cruise around inside a university, a museum, restaurants, hotels… it’s a great way to check everything out before you go there.

iiCosmo
iiCosmo takes yet a different approach.  They’ll bring you to Japan, Thailand, Australia, South Korea and Iran.  Rather than roam around they stream 3d videos using a wide lense.  Though it’s less flexible (you can’t freely move around), it’s an easier way to scope out a city.

Google Streetview
The granddaddy of streetview sites.  Google has the most locations and has spawned such websites as streetview fun exploiting all the crazy things Google’s 3d camera has caught on video.   Seen the Bikini Car Wash?