I need a domain that gives unlimited space, supports cgi/perl, supports php, allows unlimited subdomains, SSI (Server Side Includes), and with no ads. If anyone can help me, please do so. It would help me very much. Oh, and if you think hispeed.net would be good, wrong. They just binded with Us.net and no longer give out unlimited space. Thanks in advance.

There is no such thing as unlimited storage space nor is there such a thing as unlimited bandwidth. I personally would steer clear of any host that advertises either. If you read the TOS of any such hosts you WILL indeed find the storage capacity and bandwidth are both very much limited and monitored.

I've also never heard of a site offering unlimited subdomains.

You really should re-evaluate your requirements, remove everything that is preceded with "unlimited" because it just doesn't exist.

I would take a look at http://www.futurequest.com