Quick build I made for Taric, because when i play this build I usually carry my team to the win.
Sorry for my english it is pretty bad, but whatever.

MP because I use that for my AP champ, but maybe AP runes would have been better for heal.
Armor et Magic Resistance for tanking, it is always needed for taric.

Clarity is a must have in early game, Taric use it so much.
Exhaust is also cool when you stun someone, just slow him down so he can almost don't move.

The first problem with Taric is its mana. So let's begin with Meki Pendant. Try to stun when it is needed to keep your mana.
Then, boots with cooldown is a must have for Taric.
I choose ability power way after that for better heal, some taric choose armor for tanking, but i personally think that it is a bad choice, because heal is bad and your spells have no utilities so.

You can solo bot with this build, just defend correctly and everything is gonna be alright.

+ Heal
+ Solo lane
+ Late game

- Mana
- You could do no kill, so in mid game try to team work and to gank.

I upload a replay you can DL and watch with LOL Replay.
Here is the DL link : http://dl.dropbox.com/u/5466129/Taric%202%203%2015.lrf