I am aware of the legislation's in Nevada, but what is happening with the technology currently. When is it expected to be commercialized ?
There's a good, if slightly overly optimistic study done by KPMG and the Center for Automotive Research called Self Driving Cars: the Next Revolution. You'll be seeing more and more semi-autonomous features within the decade, starting in higher end vehicles (all the major automakers are working on such systems and we already have advanced cruise control and lane departure warning). However full autonomy is still a fair ways off, for cost as well as perception and institutional/legal issues. One of the problems with commercializing Google's car is that the sensor systems cost over $250,000 (see http://www.businessinsider.com/google-self-driving-car-sensor-cost-2012-9). Even with economies of scale, we're a ways off from that system being affordable.
Google's accomplishments are VERY impressive. They've expanded to more vehicle types and more uses for testing (e.g., commuting to and from Google). They still don't work in all environments (snow being one issue).
By the way, though, California and Florida have joined Nevada in passing laws regulating experimental use of autonomous vehicles on public roads.
Hope this gives you some info.