There are many places where you can find useful information on the Internet, but here are several that should provide a good overview of industry information. All of these will have substantial amounts of information on topics that are focused on IT-related industries, but there are also some, such as the first four sites listed as follows, that focus specifically on IT:
TechTarget.com: This is a publisher of over 100 websites on IT markets such as virtualization, security, storage, app development, management, and so on. They all have a tremendous amount of industry information, including white papers, webcasts, and videos (these are from third-party research firms as well as tech companies).
TechRepublic.com: This is similar to TechTarget in that it has a myriad of IT topics. However, the website has IT professionals as the authors of the content. As a result, this is a great place to find new contacts and to get answers to questions.
Dice.com: Founded over 21 years ago...