I've looked at the Volt extensively, and I will say that - almost across the board - Nissan's Leaf is better. It goes further without a recharge (approx. 100 miles), it's 7 or 8 thousand dollars less on the sticker, and it's a smoother ride with similar bells and whistles. The one biggest drawback with the Leaf is that, as of the day of articles I read on it, it does not have a fossil fuel-based backup system that kicks in when the electric engine runs out of juice. Therefore, you could easily become stuck if you do extensive travel.
Having said that, we're still a few years away before this technology gets perfected, or even close to. I'll hold off and just get a cheaper 40 mpg car if I need to save a buck.