I don't list them! Honestly, a resume of works isn't how I get most of my clients. Though my profiles speak to my experience (in vague terms) I usually consult with my client and provide them samples I believe are relevant. Sometimes I do a custom sample. The actual writing is what lands me clients.

That said, obviously when I work with literary agents they know I worked with x famous person because they were on the project. And some of that info may be passed onto other agents in the firm, etc. So, for those in the industry, they sometimes know.