Well, like many I was researching for hours finding all the important interests for a campaign.
Then I found JR's Broad targeting Formula which slashed my research time down to about an hour.
I thought that was amazing in itself but now I've found Targeting Inspector which does it all in about 5 mins!!
Not only does it save you HUGE amounts of time but it also gives you interests that you would never have even thought of or found just by typing into the interest box.
If you're serious about getting the maximum amount of campaigns out in a day and with profitable/passionate interests, you really need this tool in your arsenal. There's a lot of BS stuff out there that you need to ignore but this ain't one of them :)