For example, if I wanted to search for articles about Google Docs sorted by date, I'd type Google Docs /date. If I wanted to search for pages discussing Google Docs in the context of handheld computers like cell phones, I could type Google Docs /gadgets.

Lots of slashtags are already defined but users can make their own, a process involving associating sites with the slashtag so Blekko can get a flavor of the type of content required.

A surprising number of seemingly obvious slashtags have not yet been defined--I tried to search for mentions of myself relating to some Kindle eBooks I've recently written, for example, but there isn't yet a /kindle slashtag.

Blekko's search results aren't too great. Courtesy of a little vanity searching using my own name (surely the standard method of testing a search engine), adding the /date slashtag, revealed that Blekko didn't recognize "Keir Thomas" as a individual's name, and returned separate results for "Keir" and for "Thomas." Surely being able to spot names is the kind of thing they teach in Search Engine 101 class?

Blekko's other big trick is that users can mark results as spam and have them instantly removed from the list, after which they'll never appear again in search results for that user.