Oh Yeah! That's a really popular internet video. I'd love to have that car! It looks like so much fun. It's pretty reasonable starting at 20,000 British Pounds. When you consider the performance and the fact that it is hand-built.
I actually do think it's just barely street legal enough for the US. Jay Leno has the first one ever brought to the US.
Yes, the ATOM is one of the two most scintillating fun cars (still would buy a F430 or GT2 if I had the money)...the other one is the Tesla Roadster (http://www.teslamotors.com)
..<4sec (0-60MPH) with full torque of 211 pound-feet at zero RPM and up...and all that at > 100MPG (effectively). The Tesla looks nice too.