WowAce

What is the enhancement in mind? How should it look and feel?

Long Term Durations:
The Brew of the Month brews - They all have a 14 day duration, and you get a different one each month. I'll have to work out getting you the item IDs but I will.
http://www.wowhead.com/?search=dalaran+redBottle of Dalaran Red and Cask of Dalaran Red - 365 day duration. The scuttlebutt is that it turns into a permanent item...I'm crossing my fingers! I'll get you the item IDs on this too, since wowhead has a lot of them, and I'm not sure which is which.

Short Term Durations: (Since these don't have a duration other than disappearing after you log out, perhaps a seperate tooltip for them, or a different icon on the LDB plugin when you have them, so if you don't want to log out without giving them to someone else you have a visible reminder. Just a thought.)
Mage food
Pink Gumball - 65780 - From the new loot card pinata in the newest incarnation of TCG. Its conjured, like mage food and healthstones.

This is just my thoughts without being able to log in game and get more info. I'm sure I'll think of more by day's end.

The Brew of the Month stuff is definitely something EggTimer should be tracking.

I avoid doing any sort of tooltip-scanning with this addon, which I would have to resort to in order to support tradable items with timers on them. That's why I'll be focusing on BoP items, and other durations that have a fixed length and can be guaranteed to last a fixed amount of time. 3.2 is giving us more item information without scanning, however, so I'll always be open to extending the scope of this addon should Blizzard make it easier.

My reasoning is that the current tooltip timers are horribly inaccurate, tooltip-scanning is yucky, and my code is already pretty ugly without complicating things even further. :P