I just came across a post about Germany's most anticipated Web2.0 sites that dates back to last August. Since this is almost exactly one year ago I decided to spend half an hour of my life and conduct a completely unscientific survey to see how many of these startups are still around. For this reason I simply looked at the web sites to see if they are still here and checked if there are recent posts in the company blog to check if the site is a zombie (if there is no blog I checked the press releases). The result is: 51% are still around, 36% are gone (or not started one year later). The rest seems shaky (last blog post 6 months ago) or unknown (state cannot be determined by looking at the blog).
If you consider that these startups were above the rest ("highly anticipated") and that checking if there are even online one year later is a very low barrier I was surprised by the low survival ratio. But one can regard this as positive: "quick failure" is a good strategy for testing ideas.