Well, I got tired of paying for it, so a friend of mine found a great 10mb line server. IT can hold up to 350 people in it, which is pretty good all considering. Mainly I just go on with a few freinds and hack crap to peices/ instance runs, arena ect. Loads of fun and free.
-Duplicate your wow folder (so you can still play your orignal)
-install cracks and addons needed
-register on their site (for an account)
-play.
-Servers do tend to get laggy sometimes. BUT its free..... + its almost like your own semi private WoW server. I suggest paying with freinds if you go Horde.. few Horde players.
One thing I will warn you about again is the amount of players.. D.Hell only has about 8 to 70 on at any given time. NOt the 4k payed servers have sadly