Jack Shedd referenced an Adaptive Path report, How ROI Changes User Experience, in a recent post. The gist of the report is that valuing user experience will make it more credible in the world of business. Previously, the report would have set you back $395, but the report is now free to download (PDF, 412kb). It's basically making a case for investment into user experience.
While not necessarily a thrilling read, but you could at least muddle through and extract a few talking points to pitch your next client. Though, it doesn't have to be the rocket science business-speak that they dish out either. It's can be as simple as better design and user experience will lead to higher returns. However, if you do work in a corporate environment, quoting it verbatim might be the better way to go.