One of the hosting providers asked a question on MSDN forums that which licensing type would best suit their business, my reply to that question was marked as an answer, for complete thread kindly follow the link:
So in this case when you would be going towards the licensing model, you will be opting for SharePoint 2010 (Enterprise / Standard) for Internet Users / Sites and hence after this you won’t be worrying about CALs as CALs are only for Internal Users for masses you can’t calculate CALs so a totally separate licensing scheme is given for this case especially applicable to Hosting Providers.
Licensing Info: http://sharepoint.microsoft.com/en-us/buy/Pages/Licensing-Details.aspx
