www.hostgator.com - unlimited disk and bandwidth. Never truly unlimited.
They limit the types of content you can host (no media sites), they set inode limits (http://support.hostgator.com/articles/pre-sales-policies/rul...), they will suspend you if you use too much server resources. Pretty much anything to keep you from using "unlimited" resources.
There are a ton of other examples. I would check out www.webhostingtalk.com if you want to see all the issues with these type of hosts.
They do explain that other limits make it essentially impossible to actually utilize "unlimited disk/bandwidth". And they don't mention unlimited on the home page. But fair enough, you found one.