Linden Labs recently added voice capabilities to Second Life. Their beta test went public in March, and commentary has been, for the most part, positive. Voice is a natural extension for MMO games, and introduces new IP issues that will eventually crop up, e.g., voice theft. Digital voice means you can capture someone else's voice relatively easily. Could you create a voice synthesizer based on someone else's speech patterns and tone? Just a thought. In any event, Second Life just got a whole lot more interesting for the rest of the world who doesn't already spend every waking moment as an avatar...