Debian 9983 Published by has released Nginx 1.2.1 packages for Debian

Dotdebs packages of Nginx 1.2.1 are now available for Debian 6.0 Squeeze (amd64/i386). They fix some bugs and enhance the IPv6 support. Please take a look at Nginx official Changelog before upgrading. Please also note that Naxsi has been upgraded to the 0.46-1 version.
  Nginx 1.2.1 for Debian