nginx 0.8.50:
    *) Feature: the "secure_link", "secure_link_md5", and
      "secure_link_expires" directives of the ngx_http_secure_link_module.

    *) Feature: the -q switch.
      Thanks to Gena Makhomed.

    *) Bugfix: worker processes may got caught in an endless loop during
      reconfiguration, if a caching was used; the bug had appeared in
      0.8.48.

    *) Bugfix: in the "gzip_disable" directive.
      Thanks to Derrick Petzold.

    *) Feature: the "image_filter_jpeg_quality" directive supports
      variables.

    *) Bugfix: a segmentation fault might occur in a worker process, if the
      $geoip_region_name variables was used; the bug had appeared in
      0.8.48.

    *) Bugfix: errors intercepted by error_page were cached only for next
      request; the bug had appeared in 0.8.48.

    *) Change: now the "server_name" directive default value is an empty
      name "".
      Thanks to Gena Makhomed.

    *) Change: now the "server_name_in_redirect" directive default value is
      "off".

    *) Feature: the $geoip_dma_code, $geoip_area_code, and
      $geoip_region_name variables.
      Thanks to Christine McGonagle.

    *) Bugfix: the "proxy_pass", "fastcgi_pass", "uwsgi_pass", and
      "scgi_pass" directives were not inherited inside "limit_except"
      blocks.

    *) Bugfix: the "proxy_cache_min_uses", "fastcgi_cache_min_uses"
      "uwsgi_cache_min_uses", and "scgi_cache_min_uses" directives did not
      work; the bug had appeared in 0.8.46.

    *) Bugfix: the "fastcgi_split_path_info" directive used incorrectly
      captures, if only parts of an URI were captured.
      Thanks to Yuriy Taraday and Frank Enderle.

    *) Bugfix: the "rewrite" directive did not escape a ";" character
      during copying from URI to query string.
      Thanks to Daisuke Murase.

    *) Bugfix: the ngx_http_image_filter_module closed a connection, if an
      image was larger than "image_filter_buffer" size.

    *) Bugfix: $request_time variable had invalid values for subrequests.

    *) Bugfix: errors intercepted by error_page could not be cached.

    *) Bugfix: a cache manager process may got caught in an endless loop,
      if max_size parameter was used; the bug had appeared in 0.8.46.

    *) Change: now the "proxy_no_cache", "fastcgi_no_cache",
      "uwsgi_no_cache", and "scgi_no_cache" directives affect on a cached
      response saving only.

    *) Feature: the "proxy_cache_bypass", "fastcgi_cache_bypass",
      "uwsgi_cache_bypass", and "scgi_cache_bypass" directives.

    *) Bugfix: nginx did not free memory in cache keys zones if there was
      an error during working with backend: the memory was freed only
      after inactivity time or on memory low condition.

    *) Feature: ngx_http_xslt_filter improvements.
      Thanks to Laurence Rowe.

    *) Bugfix: SSI response might be truncated after include with
      wait="yes"; the bug had appeared in 0.7.25.
      Thanks to Maxim Dounin.

    *) Bugfix: the "listen" directive did not support the "setfib=0"
      parameter.

    *) Change: now nginx does not cache by default backend responses, if
      they have a "Set-Cookie" header line.

    *) Feature: the "listen" directive supports the "setfib" parameter.
      Thanks to Andrew Filonov.

    *) Bugfix: the "sub_filter" directive might change character case on
      partial match.

    *) Bugfix: compatibility with HP/UX.

    *) Bugfix: compatibility with AIX xcl_r compiler.

    *) Bugfix: nginx treated large SSLv2 packets as plain requests.
      Thanks to Miroslaw Jaworski.

    *) Feature: large geo ranges base loading speed-up.

    *) Bugfix: an error_page redirection to "location /zero {return 204;}"
      without changing status code kept the error body; the bug had
      appeared in 0.8.42.

    *) Bugfix: nginx might close IPv6 listen socket during
      reconfiguration.
      Thanks to Maxim Dounin.

    *) Bugfix: the $uid_set variable may be used at any request processing
      stage.

    *) Change: now nginx tests locations given by regular expressions, if
      request was matched exactly by a location given by a prefix string.
      The previous behavior has been introduced in 0.7.1.

    *) Feature: the ngx_http_scgi_module.
      Thanks to Manlio Perillo.

    *) Feature: a text answer may be added to a "return" directive.

(joerg)