apache virtual host and "Dynamic" Domains
I regularly use symlinks to link multiple domains to the same webroot when doing configurations similar to this, there is no explicit harm in that solution so definitely no reason to shy away from it.
A good way would be to decide which type of URL should be the canonical one, and use mod_rewrite to redirect URLs to it - for instance, match requests to domain.com and redirect them to www.domain.com. There's plenty of tutorials on how to do this available on the web which you should be able to find easily.
Off the top of my head, you could use something like:
RewriteEngine onRewriteCond %{HTTP_HOST} !^www\.$ [NC]RewriteRule ^(.*) http://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]That would cause problems if you're using SSL, though, due to the hardcoded http://. I think you could change the RewriteRule line to the following to avoid that:
RewriteRule ^(.*) %{SERVER_PROTOCOL}://www.%{HTTP_HOST}%{REQUEST_URI} [R=301,L]