lammert - 12:14 pm on Jun 9, 2010 (gmt 0)
There is a wildcard DNS option which allows you to use '*' instead in the left part of the domain name, but as far as I know it only works with subdomains, i.e. *.example.com which matches all subdomains of example.com. Adding *.com to map all the domain names to one IP address on your server only works if you are able to create a zone file for the .com domain. You could try it but if it doesn't work your sites might be unavailable for a short time due to invalid answers on DNS requests.