BMW service information is available at
www.bmwtis.com but note that you will pay.
Another route for BMW serivce data info is eBay, where you can buy a CD or DVD with the TIS on it. These contain proprietary BMW service info that is being bootlegged. The CDs generally contain information for all models, but you do have to be careful to get a CD that is recent enough to cover your vehicle.
Some eBay sellers sell whole sets of CDs that also have the parts manual (ETK or EPC), electrical, etc, as well.