Streaming with IPOD Touch

I don't have an ipod touch, but I'm looking into getting one. I understand there is a way to stream music from itunes if the ipod touch is connected to the same wifi network as the computer running itunes. I was wondering, is there a way to stream music from itunes over the internet?

For example, let's say the computer that's running itunes is in my house and is on. Let's say I'm using my ipod touch and I am at work (which is at a separat e location) connected to wifi there. Is there a way I can stream music from my itunes at home while I'm at the other physical location (as long as both devices are connected to the internet (although they may be on separate wifi networks)?

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