They have a page that provides info on their "unlimited policy"
Quote:
What does UNLIMITED mean?
UNLIMITED storage and UNLIMITED transfer means you can use unlimited amounts of disk space and bandwidth for your active website. This means you can rest assured your website will not be shut down for exceeding any bandwidth or storage limitations.
Let us be front up with you though....We are not going to make you sift through our terms to figure out where the catch is. We have it right here in plain view so there is no misunderstandings. Great communication is key in a relationship. So, here is the deal.....if your site isn't well optimized and is causing issues for others on your shared server (either because it's abusing the CPU, hoarding up RAM, or doing loads of disk I/O), you could be in danger of account suspension.
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What else is not allowed on "UNLIMITED"?
Again, to be up front.... You can not use the account for the sole purpose of storing files. You must have an active website. Here are some other specific things not allowed:
* Copyrighted material that you do not have a license to distribute.
* File Sharing | File Upload | File Archive | Backup | Site Mirroring | Content Distribution Sites
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http://nakedhosting.com/unlimited/