I saw this question recently and thought I would publish the answer:

"NO, nothing special is needed, although your ISP must allow web port access"

Windows Home Server uses a dynamic DNS service to enable access to http://<servername>.homeserver.com, can configure your router to open the appropriate ports (80, 443, and those needed for remote access) and if you share a guest password to your friend/relatives, they will be able to browse your pictures.  More information on the domain can be found at http://blogs.technet.com/homeserver/archive/2007/08/08/homeserver-com.aspx

To do it, open the Home Server Console

Open the settings page

Go to the remote access page

Select the change or configure option to get to the main wizard

Type in your Windows Live ID details (only 1 domain per ID / server)

Choose the domain name you want

Confirm the domain is available and press go

that is it.

ttfn

David