Hearthpwn

This deck has been surprisingly successful in many match-ups and even on ladder. 

This deck was built around the unexpected and underrated Paladin secret library.  Specifically redemption.  It is a fun and challenging deck to play and requires careful thought about how the secrets are played.  The deck has done well for me against a number of match-ups.  Currently it seems to struggle against mage decks due to the mage hero power and polymorph can really ruin any redemption combos you set up.

Key cards:

1. Secret Keeper - In a deck where secrets only cost 1 mana this card can do a lot of work.  A turn 1 secret keeper followed by a coined noble sacrifice gives you a nice 2-3 minion and insures that it can't be easily traded with.  This card also rocks against hunters and mages whose secrets also buff your minion.
2. Redemption - I use redemption with some of the more sticky minions such as belcher, sun walker, and commander.  Occasionally I can get a redeemed Tirion, which is quite satisfying.  This can cause a huge headache for opponents.  Redemption also synergizes well with just about every minion in this deck (divine shields are returned to minions, loot horder allows you to draw another card, belcher belches up an additional ooze, etc).  Just watch out for a hex or polymorph, which pretty well counters this play.
3. Avenge - Totally underrated.  A 3/2 buff for 1 mana is a great deal and if it is given to a minion with divine shield it is even better.  The fact that it buffs your secret keeper is gravy.
4. Eye for an Eye - Arguably the worst of the paladin secrets, but can make a difference when you are racing your opponent down. 
5. Divine Favor - gives you much needed card advantage, especially in control match-ups.  Having the card draw can also allow you to make more strategic combos such as redemption on Sunwalker/Belcher or a noble sacrifice paired with an avenge.
6. Truesilver Champion - Great weapon, helps you to maintain board control or can help you rush an opponent down, plus it heals you as well.
7. Sunwalker/Belcher/Tirion - These are three of the most annoying taunts to take care of and work amazingly well with redemption.

11-18-14 UPDATE:  I removed mad scientist from the deck since it gave you no control over how/when the secrets are played and secrets that are pulled out from the death-rattle do not buff your secret keeper.

1-21-15 UPDATE:  Took out Amani Berserker and added in Shielded Mini-bot to fill the 2 mana slot.  Arguably a better choice considering the theme of the deck.  This does make the deck extremely vulnerable to Blood Knight, but I see that so rarely in the current meta.

3-22-15 UPDATE:  Removed Raging Worgen and put in Coghammer, which adds to the difficulty of your opponent trying to clear your board or lets you trade more effectively.  Works great with the theme of the deck.

What I enjoy most is that many players just aren't sure how to handle this deck because paladin secrets are so uncommon.