Blekko is definitely a cool new search engine. The slash tag feature is unique and gives it an edge that people will be interested in. However, I do not think it will ever reach the popularity of Google due to it’s complicated nature. I think Google’s greatest strengths is it’s simplicity; it’s so easy anyone can use it to it’s full potential. Blekko is not like that.
Coming from someone who doesn’t have a lot of time on her hands, having to learn how to use a search engine does not appeal to me when I have Google available. Of course I took the time to learn about Blekko, but I’m in the industry. I don’t think the average person will want to do that.
I’ve done some research and I think the best new search engine is Bweezy. Similar name, but very different from Blekko. Bweezy offers Google results, which I love. It also lets you open search results in the same window as the search, which eliminates the need to open a ton of tabs! I’d check it out if you’re into new search engines.