Learn2play: a guide to class roles

While trying to explain the difference between MT, OT, DPS and healer to a new player, I found this well-written guide to party roles in WoW. If you're unsure quite what the difference between a main and offtank is, or which classes are considered "DPS", it's a great read.

As a druid, I love the fact that my class appears under all headings, but as a recent instance run taught me, it's best to ensure you know which you are before you begin. Hybrid classes can cause no end of arguments when they fail to remain hybrid, too, so don't be afraid to switch roles if necessary -- a healing class that refuses to heal when the only other healer is out of mana is a great party annoyance.