Oh, there's tons of ways to make someone talk without torture. They're all the same ways you get someone to talk even when you're not using magic. The only thing Compel Truth does is force people to say something true when they speak. Of course, a clever person can say something that is true, but isn't the whole truth, or is something that can be easily misinterpreted by others.
But seriously, look at any cop drama on how they get suspects to talk. Look at any show like Leverage or Oceans Eleven where they con someone into giving up information. Now you just have magic juicing things a bit. Remember, the subject of a Mental Manipulation spell doesn't necessarily know they've been hit with it unless they make the roll to perceive it. You choose your targets well, and maybe juice things a bit by slipping them a bit of eX and having your face be their new best friend while they spill their heart out...