One thing I've picked up in the recent poco wars is a way to get intel on someone's whereabouts without paying.
Normally Locator agents charge 25k isk. However if the target is in a wormhole the agent tells you he won't be able to trace him before you pay the money.
So if you're in conflict with players and you want to know which of them are in W-space you can do so for free using a Locator agent. Just cancel if he offers to find them for you in return for payment - because that means they're not in a wormhole.