Want some industry information about getting the most of your Google AdWords budget? Check out the Google Optimization Center, which gives you some great strategies depending on the type of industry you're in. PDF files are offered in each individual sector. Areas covered include automotive, education, health care, retail, travel, technology, local, finance, and business and industrial markets.
AdWordsPro Sarah explains how these documents can be used.
[I]f you run a travel site, you could download the travel optimization PDF for tips on ways to increase the ROI on your top trips.
What else can you get out of this? You'll know when to better target your campaigns (as Sarah says, there's no "one size fits all" method for advertising) and how to do it.
Forum discussion continues at Google Groups.