Gracefully exiting target disk mode?

Hi all,
I just purchased a new 2011 Mac Mini and have been using it in target disk mode for some stuff and was wondering how do I exit target disk mode on the Mac Mini. I eject the Mac Mini from the computer it's connected to and then the only way i've found to exit target disk mode on the Mac Mini is to hold down the power button, but i've always thought this wasn't a good idea to shut off the computer this way or is it acceptable to do this when your booted up into target disk mode?
Just curious maybe there is another way to exit it that i'm overlooking but all I see is the floating Firewire and Thunderbolt icons there isn't any shutdown button or anything.
Thanks for your help

I would not worry about it.  Using the power button is the proper way to exit.  If for some reason, the shorter ~1 sec press doesn't shut down for you, feel free to hold for the 3-5 force shut down.  I've been around mac users for a very long time and have never actually heard of anyone 'actually' have a negative effect (that full reboot couldn't fix) from force shutting down.
I wouldn't lose any sleep over using it.

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