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Max os x service start up : StartupItem

A good guide is available here

File:  /Library/StartupItems/RRiki/StartupParameters.plist:

{
 Description = "RRiki server";
 Provides    = ("RRiki");
 Uses        = ("Ruby");
 OrderPreference = "Last";
 Messages =
 {
  start = "Starting RRiki server";
  stop = "Stopping RRiki server";
  restart = "Restarting RRiki server";
 };
}

File: /Library/StartupItems/RRiki/RRiki

#!/bin/sh

##
# RRiki service startup script
##

. /etc/rc.common

StartService ()
{
    ConsoleMessage "Starting RRiki"
    cd /Users/kghose/Source/Rriki2/
    /usr/local/bin/thin start -eproduction -d
}

StopService ()
{
    ConsoleMessage "Stopping RRiki"
    cd /Users/kghose/Source/Rriki2/
    /usr/local/bin/thin stop 
}

RestartService ()
{
    ConsoleMessage "Restarting RRiki"
    cd /Users/kghose/Source/Rriki2/
    /usr/local/bin/thin restart -eproduction -d
}

RunService "$1"

To manipulate the service:
sudo SystemStarter restart RRiki
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