When Google Earth 6.0 was released, it completely changed the way that Street View worked. However, Google kept the older layer active for previous versions of Google Earth so that those users could continue to use Street View. Not anymore.
Sometime in the past few weeks, Google has turned off that old layer. If you’re wanting to use Street View in Google Earth, you’re now required to be using version 6.0 or higher.
Here’s a quick look at how to use Street View in Google Earth 6:
In addition to that video, I’ve built a few other Google Earth tutorials to help explain some features, including how to use historical imagery, elevation profiles and a few more.
Beyond that, Google has just released Street View imagery in South Korea, primarily in Seoul and Busan. As you can see from the screen shot below, the imagery in those is very sharp.
You can read more about the new South Korean Street View imagery on the Google Lat Long Blog.
If you still need to upgrade to Google Earth 6 to get the new Street View features, you can always download it (for free!) from earth.google.com.