While I don't really know what you have in mind here, I just want to pass on a friendly reminder re the "Unlimited Policy" (see http://dreamhost.com/unlimited.html) which states, in part:
"Here are some specific examples of things not allowed:
* Copyrighted content you are not the copyright holder of.
* File upload / sharing / archive / backup / mirroring / distribution sites.
* A site created primarily to drive traffic to another site.
* [b]Making your account resources available (whether for free or pay) to the general public. [/b]
(emphasis is mine)
Be careful if you are thinking of doing this! In addition to the prohibition listed above, sites that do this never last long here. It won't take long before some idiot violates the terms of services with posting illegal material, or copyrighted material they do not have the right to publish, and gets your account terminated by doing so.