For some time now I have created websites that have earned good money from adsense, but although I have an account with all of the UK affiliate networks, I have never really added affiliate products or links to my sites. The thing I worry about is that if I download a data feed, add all the products to a database and display them on my site, how do I know if the company who sells the products change the prices or stop selling the product entirely? I don;t have time to keep checking every product is still valid, and I certainly don't want a website full of broken affiliate links. Even mini sites with fewer products would be nightmare if I had several mini sites to manage. I know with some affiliate schemes you can use XML to display life data feeds, but these seem few and I have little experience with XML. How do you guys mange to keep things in shape with affiliate schemes, is there something I am missing?