Can you explain what you mean by Google Voice integration? I'm a user of both GV and Gmail and I'm wondering if there is something I'm missing, like being able to see my GV texts/voicemails right inside Gmail or something?
* set GV to forward txts to GM, replying to the email will reply to the txt
* have transcribed voicemails emailed to you with a link to play the original in the email
* use the "Call phone" button under chat to make outgoing calls via the web for free (for now)
I think that's what he meant, at least. Only one of those things (the last) isn't available outside of Gmail itself.