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Mumble and TeamSpeak Server Hosting
Add Ons
Here is a list of very helpful add ons that everyone should have:

Raiding
Deadly Boss Mods (DBM)

Inventory, Bags, Alts
Altoholic
Bagnon

Economy
Auctioneer

Combat, DPS
Recount

Professions
Gatherer

All of these add ons can be downloaded at Curse.com