What does everyone use as their licensing solution for Windows hosting? To my understanding there is the "client/access license" for $29 per client and "external connector license" for unlimited client access per server for a one time $1999.

Isn't there a license agreement for ISP's? Are there any other solutions you are using with your MS servers hosting multiple end users?

Check this link out SPLA Licensing Models it should answer your questions.

-d