The room couldn't be dark if she were to get anything useful on tape.

There's very little useful on the web sites, but here is the discussion.

He'd been useful to her on this mission, but that use had come to an end.

It was true the boy might be useful on a long trip.

Seems like the kind of thing that might be useful on the Raft.

It could end up being useful on other cases like this one.

If we create a legal framework for the future now, it could be very useful to our thinking on the environment.

A breakthrough would be both useful and necessary on three points.

The blanket, too, would be useful on a cold night.

Also, www.interfaith.org is useful on the subject of different religions.