WowAce

Displays information on your pet, such as name, level, combat ratings and attributes.

Use
PetInfoFu keeps track of your pets, including your stabled pets. Optionally, it will track your history of taming pets. Clicking on the FuBar menu will bring up the training dialog.

For hunters, you can click on a stabled pet in the FuBar tooltip and a small draggable tooltip will pop-up showing you the skills of that particular pet.

Options
Show pet's name (True) - Displays the name of your current pet, assuming it is not currently dismissed.
Show pet's combat statistics (True) - Shows your pets combat statistics, assuming it is not currently dismissed.
Show pet's attributes (True) - Shows your pets Strength, Agility, Stamina, Intelligence and Spirit, assuming it is not currently dismissed.
Show pet's skills (True) - Shows your pets skills, assuming it is not currently dismissed.

Hunter Only:
Play sound: On TP gain - Play a sound when the pet gains Training Points (TP) or is able to learn an available skill.
Show Mend Pet Frame (False) - Toggles a dragable frame when Heal Pet is active
Stabled Pets|Show stabled pets (False) - Shows you which pets are currently in your stable and their level.
Mapnotes|Enable Stable mapnotes (False) - Will place an icon on the map for each Stable you visit. Needs Cartographer to be installed.

Warlock only:
Show nethered demons (False) - Keeps track of the skills of the demons you can summon, but are currently gallivanting in the Twisted Nethers.

Acknowledgements
This add-on is a continuation of corgi's PetInfo which he kindly allowed me to update to WoW 2.0. I'd also like to thank gnancy for suggesting I add support for Demonic Knowledge and helping me test it.

Install: extract the FuBar_PetInfoFu folder into

\World of Warcraft\Interface\AddOns\