Surprise, it's the bad_httpd_conf error!
So, the error message I'm getting:
I'm trying to get geenamatuson.com (a Network Solutions-hosted domain) to use the display what appears on geenamatuson.2bitpx.com (a Dreamhost-hosted domain). We set the A Record of geenamatuson.com to the "non-editable DNS record" for geenamatuson.2bitpx.com, and this error is the result. I'm a little lost as to where to go from here, I've submitted two tickets to Dreamhost (it's been nine hours; I've heard some sources say it takes 2 hours for the DNS to refresh, other sites say up to 48 hours), and I've tried the "edit, save" trick on the subdomain itself, to no avail.