Google has launched its own version of customisable, vertical search, reports John Battelle. The service uses Google Co-op which the company admits has stalled a bit since launch, and differs from other offerings, like Rollyo, by allowing any number of domains to be searched, filtering for particular pages, and adjustment of the weighting of results.

Update: there is also a feature to allow “volunteers” to add sites to the vertical in question which could be great to getting a bunch of like-minded people to collaborate on building the ultimate vertical search for a sector.