There is an app from Nokia in beta stage. it's called "Play To." It uses DLNA to stream to compatible devices. It's not available in the market yet since it is in Beta. If you want more info on it, check out the Nokia labs website here:
If you want to download it, you have to sign up (for free) to Beta Labs. Or, you can head over to the following thread at XDA-Developers where someone made a QR Code download: