Neopets: Treasure Keepers
Currently, the employee feature is disabled. It was briefly enabled during Closed Beta; however, the Meteor Games Team decided to take the system down, revamp how it works, and add some improvements. During Closed Beta, you were able to hire employees to sell items while you were away, either adventuring or just not playing the game.
We don't know when this feature will be back, or if it'll even resemble the previous incarnation, so stay tuned!