Badminton Alberta have received the updated Laws of Badminton from the Badminton World Federation (BWF). These came into effect following the BWF AGM in Tokyo, May 2006. The new scoring system for badminton is explained within these Laws: BWF Laws of Badminton 2006
Scotland's David Craig (European Badminton Union Accredited Umpire) gives a quick 10 step guide to the new scoring system: Rally Point Scoring - a quick 10 step guide
For a simple guide to serving in doubles: Rally Point Scoring Doubles Guide
Badminton England has a number of excellent videos available on-line. These are normally available through a subscription, but several are currently available at no charge. These are an excellent resources and the subscription is well worth it.