The Nexus One died for the general public, sadly, but continued to live on with the help of Google's own ADP (Android Developer Phone) program.
For an unsubsidized but reasonable price of $529, registered Android Market publishers (anyone can be for $25) could purchase this masterpiece, even though it was canned by Google and sold out pretty much everywhere else... until it sold out even as the ADP 3 weeks ago.
Nexus One Stock Update
Developers grew sad but Google got to work and started pestering HTC for more units. Happily, I can tell you that the Nexus One developer phone is available once again, this time with this friendly note:
Please Note: The limit of phone purchases has changed to 10 phones per transaction.