Besides organising your affliates and sponsors by means of keep a comprehensible list of those in which you are participating, optmising your banners and contextual ads may save you display advertising that is not working for you.
The best way you can achieve this is by means of file including. Get some of those scripts that let you display random banners or creat your own system and make of one location your adversiting network.
Let's say you own http://this-domain.com, you should then creat a directory devoted to advertising files, let's say http://this-domain.tld/affiliates. Put inside all your advertising and call the sponsors and make a file include by means of PHP or ASP.
Other file include options are CGI, SSI and Javascript and iframes for those whose sites are lack of another scripting support.
Call this advertisements from any other domain you own as well and this way you can easily manage change the files inside your affiliate directory to remove sponsors or add new ones, which is much better than edit file by file all your content to get your sites displaying good conversion affiliates
