THis is a quite usfull technique for grinding loot from a boss thats far in an instance. All you need is a warlock, and of course your raid party.
Step 1:Have one person die and get outside of the instance (should be the party leader)
Step 2:As soon as he's outside have all of the other players pull their ehternet cords, or turn of their internet connection.
Step 3:Have the party leader go inside, and then back outside of the instance.
Step 4:Have the party leader reset the instance.
Step 5:Have everyone log back in, and summon the party leader with the warlock.
Step 6:Grind to your hearts content