I am always on the hunt for analyst reports, which are extremely tricky to find unless willing to pay thousands of dollars (which I am not). Some resources that I have found to be useful include:

• Reuters On Demand - If the publication being searched for is from a business analyst or analyst group, the best database is by far Multex, which was bought by Reuters and is often listed now as Reuters On Demand. This database is utterly fantastic, but of course requires some sort of log-in. Certain universities will have access.
• The big analyst sites: Depending on the industry and sector being researched, the big analyst sites should be checked. Most likely everything on the site will cost money to purchase, but sometimes it is possible to figure out which study should be searched out or even little clips of the necessary info might be available. The main sites include: Gartner, Aberdeen, Forrester and IDC. (Note that there are probably tons more sites, but these are the ones I use most frequently in my research.)
• Thompson Research - provides analyst research but requires a subscription.
• MarketResearch.com - I have used this site a couple times, but have very rarely found the info I was seeking. A log-in is necessary.
• Company websites - Many times companies will give the public free access to analyst white papers because the paper mentions that company name in a positive light. This usually happens in competitive industries that are targeting business rather than consumers.