Hotwater, I'd say that nymphaeles was 'less than clear.'
Quite a few of us (myself inlcluded) have done exactly what you're looking to do, and within IIS on the WHS.
What you'll need to do is create a new virtual directory within the default website. This will place it as a subdirectory (e.g. yourname.homeserver.com/subsite) of your existing WHS site.
When you create the site: rather than direct it at a local directory (the default setting), you'll configure it to redirect it to a url (e.g. http://yourname.homeserver.com:<portnumber> )
Then, in your router, you'll forward that port number (that you used when you created the redirect site) to whatever device it needs to go to.
Usage examples:
I'm running SharePoint on my WHS; Sharepoint is configured to listen on port 8080. Therefore, I created a virtual directory that redirects /sharepoint to
http://me.homeserver.com:8080; port 8080 is forwarded in my router to the WHS's IP address.
I'm also running Webguide on my Media Center; that listens on port 1692. So, I created a virtual directory that redirects /webguide to
http://me.homeserver.com:1692, and forwarded port 1692 to the Media Center.
Once done, it's quite seamless how it works.
Words of warning:
Modifying the IIS config on WHS is unsupported, and risks breaking the IIS config in such a way that you might need to do a Server Reinstall to fix it.
Do not modify/rename/delete/move, or in any way change, the existing IIS items. I'd also highly suggest that you back up the existing IIS configuration before making any changes.
HTH,
Chris
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