PHP-FPM + NGINX

 apt-get install build-essential autoconf2.59 libpcre3-dev libssl-dev
 apt-get install libxml2-dev libcurl4-openssl-dev libpq-dev libmysqlclient15-dev

LE_VER=1.4.12-stable
wget "http://www.monkey.org/~provos/libevent-$LE_VER.tar.gz"
tar -zxvf "libevent-$LE_VER.tar.gz"
cd "libevent-$LE_VER"
./configure && make
make install
export LIBEVENT_SEARCH_PATH="/usr/local"

export PHP_VER=5.2.11
wget "http://launchpad.net/php-fpm/master/0.6/+download/php-fpm-0.6-$PHP_VER.tar.gz"
tar -zxvf "php-fpm-0.6-$PHP_VER.tar.gz"
"php-fpm-0.6-$PHP_VER/generate-fpm-patch"

export PHP_VER=5.2.11
wget "http://si2.php.net/get/php-$PHP_VER.tar.bz2/from/si2.php.net/mirror"
tar -xf "php-$PHP_VER.tar.bz2"
cd "php-$PHP_VER"

PHP_GROUP=php
PHP_USER=php

addgroup --system $PHP_GROUP
adduser  --system --home /dev/null --no-create-home --disabled-password --disabled-login $PHP_USER
adduser $PHP_USER $PHP_GROUP

patch -p1 < ../fpm.patch
./buildconf --force
mkdir fpm-build && cd fpm-build

# Alternative
# CFLAGS="-g -O2 -fno-omit-frame-pointer" CXX="gcc" CXXFLAGS="-g -felide-constructors \
  -fno-exceptions -fno-rtti  -O2 -fno-omit-frame-pointer" ../configure --enable-fastcgi \
  --with-fpm  --with-libevent=shared,"$LIBEVENT_SEARCH_PATH" --prefix="/usr/local/php-5.2" \ 
  --disable-short-tags --enable-mbstring --with-mime-magic --with-curl --enable-sockets --enable-pdo \
  --with-pdo-pgsql --with-pdo-mysql --with-pgsql --with-xmlrpc --enable-zip --with-pear --enable-bcmath \
  --with-openssl

CFLAGS="-g -O2 -fno-omit-frame-pointer" CXX="gcc" CXXFLAGS="-g -felide-constructors -fno-exceptions \
 -fno-rtti  -O2 -fno-omit-frame-pointer" ../configure --enable-fastcgi --with-fpm  \
 --with-libevent=shared,"$LIBEVENT_SEARCH_PATH" --prefix="/usr/local/php-5.2" --disable-short-tags \
 --enable-mbstring --with-mime-magic --with-curl --enable-sockets --enable-pdo --with-pdo-pgsql \
 --with-pdo-mysql --with-pgsql --with-xmlrpc --enable-zip --with-pear --enable-bcmath --with-openssl \
 --enable-soap --with-xsl --enable-xmlwriter --with-bz2 --with-curl --enable-gd-native-ttf --with-iconv \
 --with-zlib --with-mhash --enable-json --with-mcrypt --with-mysql 

make
make install

 sudo apt-get install nginx

/etc/nginx/sites-available/default

server {
    listen   80;
    server_name  localhost;
    access_log  /var/log/nginx/localhost.access.log;

## Default location
    location / {
        root   /var/www;
        index  index.php;
    }

## Images and static content is treated different
    location ~* ^.+.(jpg|jpeg|gif|css|png|js|ico|xml)$ {
      access_log        off;
      expires           30d;
      root /var/www;
    }

## Parse all .php file in the /var/www directory
    location ~ .php$ {
        fastcgi_split_path_info ^(.+\.php)(.*)$;
        fastcgi_pass   backend;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  /var/www$fastcgi_script_name;
        include fastcgi_params;
        fastcgi_param  QUERY_STRING     $query_string;
        fastcgi_param  REQUEST_METHOD   $request_method;
        fastcgi_param  CONTENT_TYPE     $content_type;
        fastcgi_param  CONTENT_LENGTH   $content_length;
        fastcgi_intercept_errors        on;
        fastcgi_ignore_client_abort     off;
        fastcgi_connect_timeout 60;
        fastcgi_send_timeout 180;
        fastcgi_read_timeout 180;
        fastcgi_buffer_size 128k;
        fastcgi_buffers 4 256k;
        fastcgi_busy_buffers_size 256k;
        fastcgi_temp_file_write_size 256k;
    }

## Disable viewing .htaccess & .htpassword
    location ~ /\.ht {
        deny  all;
    }
}

 cd /tmp
 wget http://us.archive.ubuntu.com/ubuntu/pool/main/k/krb5/libkrb53_1.6.dfsg.4~beta1-5ubuntu2_i386.deb
 wget http://us.archive.ubuntu.com/ubuntu/pool/main/i/icu/libicu38_3.8-6ubuntu0.2_i386.deb
 sudo dpkg -i *.deb

 sudo echo "deb http://php53.dotdeb.org stable all" >> /etc/apt/sources.list
 sudo apt-get update
 sudo apt-get install php5-cli php5-common php5-suhosin
 sudo apt-get install php5-fpm php5-cgi

more at http://www.howtoforge.com/installing-php-5.3-nginx-and-php-fpm-on-ubuntu-debian