Yup. Federated security (Single Sign On) is the way to go normally.
It's a pretty tricky part though so expect to pour some hours into it to get it right if you haven't done it before. It's not as easy as it looks. Very little coding required but tough to find reason for errors. Estimate high :)
http://world.episerver.com/blogs/Ben-Morris/Dates/2010/6/Converting-EPiServer-6-to-use-claims-based-authentication-with-WIF/
This is a good start...
Or the low tech solution, use activedirectorymembership provider and set cookies to last a long time :)
You will need to login first time then...Not perfect but really cheap to implement:)
We are going to switch to EPiServer Hosting for our Intranet hosting and we need a way to identify our users as we do now when we have our own server inside the domain.
Anyone having any experiences with this that they can share?