As one strategy to combat a current spam wave, we've enabled user approval.
When I'm looking at a as-yet-unapproved user, I see only the info they filled in in the signup form:
But we've realized that the problem is coming from a specific subset of IPs and those IPs generally resolve to one of two companies. So for nearly every user, I end up clicking through to see the IP and then doing a lookup on it.
And then I go back to the review queue to either approve or delete
It would be really helpful if the IP and the lookup button were presented in the review queue.
Discuss this on our forum.