The results from our visitor poll show that most people (51%) do not use inworld voice.  27% however, do like to use voice when they can.

This is a predicatable result really. 

Predictable because the core of SL users are accustom to inworld activities without voice as many people do not have confidence that it works well. Also the core SL user prefer to maintain some distance between their RL and SL personas--voice is in fact a very personal thing to share. Voice also breaks the immersion more than it adds to the inworld experience.

Maybe there is also a lack of compelling inworld content where voice is needed. Maybe the new open Vivox toolset will be a basis for new voice oriented content?

Finally, skype is a better alternative to inworld voice as there are more contacts possible and better quality. Where inworld chat is essential (and maybe should be improved to add value to inworld experience) voice is not so useful right now.