More and more companies on the internet are providing services to other people, companies, or service providers. These companies are in thier own right "Service Providers".
If you are a modeler or developer that is working for a service provider or wish to provide a new service, you may find the TMForum to be a great place to start. They provide an industry standard framework for service providers. It will also make interoperability and exchange of information easier between service providers (Because most are developing this standard).
These two are the of interest to me, but there is much more there then these two items in the forum such as application frameworks. So dig arround.
SID - Standard Information Framework for a service provider
eTOM - Standard Process Framework for a service provider.