The big names in market research reporting depend largely on the industry. You can do one-stop shopping across multiple industries at a reseller site like marketresearch.com or manta.com, which allow users to download specific reports, or a giant business information provider like Hoover's. But if you're looking for specific industry and market research, there are usually well-known analysts covering that specific industry. For example, in the high tech/Internet field, there's Forrester and Jupiter. Hospitals/Medical have Cooper and medpanel.com. If don't already know about them, you can probably find the specialists in your industry or business segment by asking around or doing some basic research.