Hi I was curious as to what the cap for hosting my domains? I have a large number of domains (elsewhere) that I need hosted for a uni project, nothing too fancy, mostly just static pages.
Each could gather around 10-100 visitors on a good day.
I am wondering what is the cap.
Because “unlimited” is vague, what can said regards to how many sites I can host? What is the maximum you recommend I could do.
Unlimited is unlimited! You can host as many domains as you want. 
You may want to try running some of your domains under different users though, so you don’t run into any memory limit issues:
http://wiki.dreamhost.com/Add_New_User
If you’re considering transferring your domains’ hosting to us, here’s a helpful wiki with instructions as well:
http://wiki.dreamhost.com/Transfer_your_hosting_to_us
Really good advice. If you have multiple sites then split them up across users.
Thanks! Also want to note, Vall, that you may still run into limits as a group… in which case, it would just be time to switch to a Virtual Private Server or a Dedicated server. Just an FYI