Even without using multiple Orchard tenants, the rewrite rule module can be used to redirect different domains or subdomains to different addresses within your site.
In the site configuration, I was able to add a list of nodes separated by commas (since I had multi-user mode, I did this in Tenancy / Default / Host).
After installing the rewrite rule module, I added a rule
RewriteCond %{HTTP_HOST} ^((www\.)?shooting\-?coach\.de)$ [NC] RewriteRule ^/+.*$ http://harald-muehlhoff.de/fotograf/ [R=302,L]
redirect all traffic from [www.] shooting [-] coach.de [/ something] to harald-muehlhoff.de/fotograf/, ignoring the original uri request. Obviously, your requirements may vary, but hopefully this example helps you get started.
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