Found this thread in the exploits section. He didn't post any pictures and wasn't sure if it worked with both Alliance and Horde so I would just like to share this with anyone who missed it.
Also, someone claimed it was a re-post, but I didn't find anything there.
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When your faction controls Wintergrasp, the Spirit Healer at the Broken Temple Graveyard turns to your faction.
http://img444.imageshack.us/img444/8...0510165442.jpg
You can stand on the edge of the graveyard, and fish into the water with the Spiritual Immunity buff. This is the Spiritual Immunity buff he is talking about.
http://img215.imageshack.us/img215/3...0510165348.jpg
http://img412.imageshack.us/img412/5...0510165402.jpg
As you can see from my buffs (bottom-right corner), I have the buff and am able to fish there while we control WG without getting ganked.
Hope this helped some of you! =)