Hearthpwn

I'm having great fun with this deck. It would seem that many opponents rage quit long before the game's conclusion. This deck is absolutely fantastic when it comes to unexpected rapid reversals, and can do some very weird things to confound and annoy your opponent. I don't think it would do amazingly well on the ladder, but it is a bit different and does a lot of things people don't normally, so you never know.
I'm having a hard time categorising it, since it has a little bit of everything - it has all the minions you'd expect from an aggro deck, but it also has a little bit of tempo, and some bigger nasties and board clearance for when you really need to make an impression.

Initially you want to play it as a typical aggro deck, hitting your opponent fairly hard in the face, and keeping essential minions off the board where possible. This means you want to mulligan hard for cheap minions and hold on to complimentary spells if you have them. Try and deal as much damage as possible whilst trying to get your opponent to waste spells an minions they might have otherwise held back and used elsewhere (for example, Hunter secrets). Some early games combos can be particularly aggressive thanks to the combination of Duplicate, Knife Juggler, Mirror Image, Sorcerer's Apprentice and Haunted Creeper. Thanks to the secondary properties of most of these minions, I'm pretty happy to see them turn up in mid and later game play too.

Somewhere into the mid-game, around turn 8, the deck will force you to change direction- this is where an aggro mage will often peter out. Defender of Argus and Sludge Belcher help retain an ongoing board presence, whilst Blizzard and Flamestrike clear the board in your favour. To help finish the game, Kel'Thuzad can be paired up with multiple taunts to create a fairly impenetrable wall. Faceless Manipulator can copy Kel'Thuzad when facing Mages or Shamans for fear of Hex or Polymorph spoiling the fun. Hogger is fairly entertaining as can provide a more or less endless wall of taunts, though I did at one point run Ysera instead, and use it as a target for the Faceless Manipulator, who of course are also great for copying the worst your enemies will throw at you.

I'll clean up the formatting on this page and sort the images out with nice thumbnails and stuff shortly!

Images of amusing situations:

A classic rage quit when your opponent realises that the Sludge Belcher will just keep coming back. The opponent had around 20 health and you'll notice they have about 4 minions on the board - but it's all for nought as they can never get through your taunts.

This aggro mage whiped my board clean, triggering my Duplicate which returned to me a Mirror Image. For most Mage decks, this is less than ideal, but it worked out well for me - I had two Mana Worms, a Sludge Belcher and a Knife Juggler sat in my hand. The result was me refilling my board with minions and throwing out 5 damage at the same time, removing some of his minions and thankfully not triggering his Nerubian Egg.

Their response was a good one - Deathwing. It cleared the board and triggered the egg, leaving him with an 11/11 minion and a 4/4 minion versus my nothing and an otherwise fairly empty hand. This would be a problem for other decks, but not for RageQuit Mage. The two Faceless Manipulators I also had kept behind must have wiped the smile off his face pretty quickly - he conceded immediately after the second one went down. Twice the Deathwing, none of the penalty- thanks!

In this example, Hogger and Kel'Thuzad make for an awesome pairing. Paladins have no reasonable response to this (nor do many decks, though a Mage might give you trouble..).

This Mage found themselves in an impossible bind thanks to taunts and Kel'Thuzad

Last but not least, I feel sorry for the guy who saw this (and am not surprised they quit before I got to have fun with them!) - that's a turn 9 Ysera followed by a pair of Faceless Manipulators.