diff --git a/boot/boot-stage-1.nix b/boot/boot-stage-1.nix
index 7b7f5503d0b..46d4a52c6c9 100644
--- a/boot/boot-stage-1.nix
+++ b/boot/boot-stage-1.nix
@@ -148,7 +148,7 @@ rec {
 
     # !!! copy&pasted from upstart-jobs/filesystems.nix.
     mountPoints =
-      if fileSystems == []
+      if fileSystems == null
       then abort "You must specify the fileSystems option!"
       else map (fs: fs.mountPoint) fileSystems;
     devices = map (fs: if fs ? device then fs.device else "/dev/disk/by-label/${fs.label}") fileSystems;
diff --git a/system/options.nix b/system/options.nix
index 53a3d11d7f6..7e186b71551 100644
--- a/system/options.nix
+++ b/system/options.nix
@@ -303,7 +303,7 @@ in
 
 
   fileSystems = mkOption {
-    default = [];
+    default = null;
     example = [
       { mountPoint = "/";
         device = "/dev/hda1";
@@ -480,6 +480,8 @@ in
     (import ../upstart-jobs/mingetty.nix) # The terminals on ttyX.
     (import ../upstart-jobs/tty-backgrounds.nix) #FIXME (assertion)
 
+    (import ../upstart-jobs/synergy.nix)
+
     # nix
     (import ../upstart-jobs/nix.nix) # nix options and daemon
     (import ../system/nixos-installer.nix)
diff --git a/upstart-jobs/nix-daemon.nix b/upstart-jobs/nix-daemon.nix
deleted file mode 100644
index 939539a42f9..00000000000
--- a/upstart-jobs/nix-daemon.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-{config, pkgs, nix, nixEnvVars}:
-
-{
-  name = "nix-daemon";
-  
-  job = "
-    start on startup
-    stop on shutdown
-    respawn
-    script
-      export PATH=${if config.nix.distributedBuilds then "${pkgs.openssh}/bin:${pkgs.gzip}/bin:" else ""}${pkgs.openssl}/bin:${nix}/bin:$PATH
-      ${nixEnvVars}
-      exec nice -10 ${nix}/bin/nix-worker --daemon > /dev/null 2>&1
-    end script
-  ";
-
-}
diff --git a/upstart-jobs/nix.nix b/upstart-jobs/nix.nix
index 8b43036485e..ff25c5691ec 100644
--- a/upstart-jobs/nix.nix
+++ b/upstart-jobs/nix.nix
@@ -170,7 +170,7 @@ in
 let 
   binsh = config.system.build.binsh;
   nixEnvVars = config.nix.envVars;
-  inherit (pkgs) nix;
+  inherit (config.environment) nix;
 in
 
 {
diff --git a/upstart-jobs/synergy.nix b/upstart-jobs/synergy.nix
new file mode 100644
index 00000000000..04b581002c2
--- /dev/null
+++ b/upstart-jobs/synergy.nix
@@ -0,0 +1,129 @@
+
+{pkgs, config, ...}:
+
+###### interface
+let
+  inherit (pkgs.lib) mkOption mkIf;
+
+  options = {
+    services = {
+      synergy = {
+
+        client = {
+          enable = mkOption {
+            default = false;
+            description = "
+              Whether to enable the synergy client (receive keyboard and mouse events from a synergy server)
+            ";
+          };
+          screenName = mkOption {
+            default = "";
+            description = " 
+              use screen-name instead the hostname to identify
+              ourselfs to the server.
+              ";
+          };
+        };
+
+        server = {
+          enable = mkOption {
+            default = false;
+            description = "
+              Whether to enable the synergy server (send keyboard and mouse events)
+            ";
+          };
+          configFile = mkOption {
+            default = "/etc/synergy-server.conf";
+            description = "
+              The synergy server configuration file. open upstart-jobs/synergy.nix to see an example
+            ";
+          };
+          screenName = mkOption {
+            default = "";
+            description = " 
+              use screen-name instead the hostname to identify
+              this screen in the configuration.
+              ";
+          };
+          address = mkOption {
+            default = "";
+            description = "listen for clients on the given address";
+          };
+        };
+      };
+    };
+  };
+
+###### implementation
+
+  inherit (pkgs.lib) optional;
+
+  cfgC = (config.services.synergy.client);
+  cfgS = (config.services.synergy.server);
+
+  clientJob = {
+    name = "synergy-client";
+
+    job = ''
+      description "synergy client"
+
+      start on started network-interfaces
+      stop on stopping network-interfaces
+
+      respawn ${pkgs.synergy}/bin/synergyc ${if cfgS.screenName == "" then "" else "-n ${cfgS.screenName}" }
+    '';
+  };
+
+  serverJob = {
+    name = "synergy-server";
+
+    job = ''
+      description "synergy server"
+
+      start on started network-interfaces
+      stop on stopping network-interfaces
+
+      respawn ${pkgs.synergy}/bin/synergys -c ${cfgS.configFile} \
+       -f ${if cfgS.address == "" then "" else "-a ${cfgS.address}"} \
+       ${if cfgS.screenName == "" then "" else "-n ${cfgS.screenName}" }
+    '';
+  };
+
+in
+
+
+mkIf config.services.sshd.enable {
+  require = [
+    options
+  ];
+
+  services = {
+    extraJobs = (optional cfgS.enable serverJob) 
+             ++ (optional cfgC.enable clientJob);
+  };
+}
+
+/* SYNERGY SERVER example configuration file
+section: screens
+  laptop:
+  dm:
+  win:
+end
+section: aliases
+    laptop: 
+      192.168.5.5
+    dm:
+      192.168.5.78
+    win:
+      192.168.5.54
+end
+section: links
+   laptop:
+       left = dm
+   dm:
+       right = laptop
+       left = win
+  win:
+      right = dm
+end
+*/
diff --git a/upstart-jobs/udev.nix b/upstart-jobs/udev.nix
index 4765f29176e..30fc4279171 100644
--- a/upstart-jobs/udev.nix
+++ b/upstart-jobs/udev.nix
@@ -22,10 +22,21 @@ let
         addUdevPkgs = mkOption {
           default = [];
           description = "
-            List of packages containing udev rules.
+            List of packages containing udev rules. All files found in $out/*/udev/rules.d/*.rules will be recognized
           ";
           merge = pkgs.lib.mergeListOption;
         };
+
+        extraRules = mkOption {
+          default = "";
+          example = ''
+            KERNEL=="eth*", ATTR{address}=="00:1D:60:B9:6D:4F", NAME="my_fast_network_card"
+          '';
+          description = "
+            Add custom rules. They'll be written into file 10-local.rules.
+            Thus they are read before all other rules.
+          ";
+        };
         
         sndMode = mkOption {
           default = "0600";
@@ -58,7 +69,13 @@ let
   };
 
   firmwareDirs = config.services.udev.addFirmware;
-  extraUdevPkgs = config.services.udev.addUdevPkgs;
+  extraUdevPkgs = config.services.udev.addUdevPkgs
+    ++ pkgs.lib.optional (cfg.extraRules != "")
+      (pkgs.writeTextFile {
+        name = "extra-udev-rules";
+        text = cfg.extraRules;
+        destination = "/custom/udev/rules.d/10-local.rules";
+        });
 
   modprobe = config.system.sbin.modprobe;