Basically what the "slashtag" does is focus the search. In the case of "Snew band," a lot of irrelevant results pop up from "what's new" to results about bands that have nothing to do with Snew. If I plug in "snew/band," a whole new set of results pops up that are specifically related to Snew the band.
There are other ways to use the slashtag as well.
You can use "xx/people" to limit the search to pages associated with a person.
You can use "xx/blogs" to limit the search to pages associated with only a blog.
You can use "xx/date" to limit the search to pages associated with only a certain date.
Of course, you can do all of this with Google as well, but it's a lot more difficult.
Below is a screen shot of a search for "honey/bees" with Blekko on the left and the results from Google on the right. You can see how much more specific the Blekko search is.
Here's a great article that describes Blekko and it's other operations in detail. Give it a try. I think you'll like it. In a future post, we'll talk about music implications.
Check out my Big Picture blog for discussion on common music, engineering and production tips and tricks.