What kind of sites are you wanting to add? Because, I am going to be starting a Scripting/Coding site with User made tutorials to help new people get going. :) (I found that places like php.net acted like you already new what the heck you were doing. ;))

I don't think it's anything in-particular as all his sites are on a wide basis of subjects and concepts.

Is HostMySig.com considered a "host"?
We don't host any sort of websites or anything, just signatures, and avatars.
We are due to relaunch this weekend, with added control panel functions, multiple plans, etc.

Hosts are defined as web hosts that provide hosting for websites and the like, not for those that provide service or hosting for signatures and/or images.

Well technically, it is hosting something but it's not a web host as for hosting web sites.