TechCrunch got their hands on one and generally had positive things to say:

The bottom line is this. If you are an iPhone user this isn't going to make you switch. If you're an Android user you will want this phone more than any other. If you're currently neither, we recommend that you go with the Nexus S. It is better than the iPhone in most ways. What you lose with the slightly less impressive screen and iOS's slightly slicker user experience you will more than make up for with the Nexus S's ability to actually make phone calls that don't drop and Google's exceptional Navigation and voice input applications.


But they also noted that "the case also feels somewhat cheap, unlike the solid feel of the iPhone and some previous Android phones."

You'll be able to get your hands on a Nexus S on December 16, unlocked for $529 or with a 2 year T-Mobile plan for $199, at Best Buy locations or directly through Google. [Nexus S]