Thanks Dread for starting this great thread.  
Cthulku pretty well coverd the basic 'lock stuff.  I just wanted to add a note to healers..I am a lifetapping maniac, that is I use a spell that turns my HP into mana.  So rarely am i at full health..dont worry about me.  i am pretty good at keeping the agro off, and i have 4-5k health.  If you have extra time/mana throw me a rejuvenate or some other heal over time. but unless you actually see me getting stomped be something, dont get frightened by my dropping health bar...its just getting turned into another shadow bolt.