iHost does not have this ability but we are getting ready to release iPanel v2 beta that does have forced ads into members websites.
I can do installation if needed however iHost, and the new iPanel will be very easy to set up
For iPanel there are some requirments for the forced ads to work.
you must be running apache 1.3.33
have root access but you will not need to login ssh everything is browser based.
Mod_layout ( installer included with script if you don't have this installed)
If you are interested i have 3 beta testers and would be willing to add you as the others are from other forums.
www.ihostdev.com iHost v3 in beta Host Automation - iPanel v4 beta With Forced Ads in User Sites, illegal file scanner, and new post 4 hosting feature www.domainuptime.comSite monitoring