Google Voice is still sort of in limbo — at least for a few more weeks until the Google I/O developers conference — but Apple's rolling out its own sort of Google Voice-esque features in OSX 10.10 Yosemite. If you're using iMessage, you get incoming call notifications on your Mac as well as your iPhone. And you'll be able to talk through your Mac as well, including making phone calls.
Basically, what we've been doing with Google Voice for some time. Or what LG's been doing with its QPair app.
We're keeping an eye on iMore.com for more "innovations."