Stolen Ipod Touch. What to do?

Okay, I was out with friends last night and asked my friend to keep my ipod touch... Next thing I know she's telling me she gave me my ipod back. But, I reassured her that she didn't. So, now we're assuming someone stole it while she turned her back... I'm not gonna start accusing her. She's trustworthy and I'll give her the benefit of the doubt=/. My question is, is there anything I can do? I feel like my privacy is being invaded! That hurts more than the stolen ipod. Can apple do anything about it? Long shot, but heyyy... I wanna call the cops! People are such thieves! F**k!