I'll have a screenshot soon, but here are the stats:

Item: "Shaamis' Everfull Mug" also know as the "Everfull Stein"
Magical: VERY (Artifact, and Intelligent)
Size: Tiny (12" tall, 6" diameter)
Base damage: 1d4, more in the hands of a Drunken-Style Master (Prestige Class coming soon!)
Enhancement bonus: +5
Physical Description: Resembling an old-world brass, silver, and densewood drinking stein, complete with a lid crested by a figure of a Dwarven Warlord with a battleaxe raised high above his head. Along the sides, a relief of mountains, dwarves, and epic battle, carved and burnt into the sides. Many dents alongside the mug indicate this Stein might have been carried and used in battle more than a few times.
Known Powers: When the lid is opened using the small lever attached to it, a seemingly random alcoholic beverage is summoned by the Stein. The Stein seems to produce the alcoholic beverage appropriate for the situation, but will sometimes produce a beverage that seems the Stein has a sense of humor, anger, or displeasure. this is the only way it will communicate.

The Stein is currently in possession by a Dwarf named Shaamis "Kegtapper" Bloodfist, a dwarven monk who is a master of the drunken-style martial arts. Shaamis does not remember when he came into posession of this artifact, but has had it as long as he can remember. Shaamis has said on more than one occasion that whenever he reaches for the Stein, it always seems to be within reach, as if it makes itself readily available. This might indicate teh Stein has minor teleportation, and an empathic link it has developed between with the owner it is attuned to.

Shaamis can be found in the City of Stormreach, at one of the many Taverns that cater to adventurers.