Another thing I did yesterday was run my first Heroic instance! Details behind the cut for you non-WoW people...
After an abortive attempt with djedi earlier (we didn't even do one full pull before the tank said he had to leave :-/), I got in with a different group, and after some trouble (some people don't realize you have to be keyed...) we got going. It was four people from Daggerfall - two paladins (one tanking, one healing), a warlock, hunter, and me (mage).
One thing I had always heard about heroic instances is that the trash hits hard. This is incontrovertibly true. The normal guys were OK, but the big guys (guardians, maybe?) consistently one-shotted me if I pulled aggro. One time we were running away to the elevator and he killed me without even stopping. We wiped I think five times just pulling one of those guardians (to be fair, the healer was having lag issues, but yikes).
The first "interesting" boss was the guy that in normal mode, turns green for spell reflect and red for melee reflect. In the heroic mode he does something totally different! Every so often he will cause each person to be either positively or negatively "charged". If two people with opposite polarity stand near each other, every five seconds they both take 2000 damage. If two people with the same polarity stand near each other, both of their damage is increased by 100%. So we had the rule that the healer would stand still, and depending on your charge you'd run up to him or away from him. Not too difficult but kinda neat :-)
We killed three bosses but couldn't kill Pantheon the Calculator - got him down to 20% a few times before giving up. I collected my three Badges of Justice and went home happy. It would be nice to run an easier heroic first, but I still need to rep grind with Thrallmar, Cenarion Expedition, Lower City, and Keepers of Time.