Microsoft has made an interesting offer to PC users - in return for participating in its Windows Feedback Program, you can receive a 'free' copy of software titles including Microsoft Windows Vista Ultimate, Microsoft Office Ultimate 2007, Microsoft Money Plus Premium Edition, Microsoft Student with Encarta Premium 2008 and Microsoft Streets and Trips 2008. However, as you would expect from Microsoft, this so-called free software comes with a price. If you participate Microsoft will ask you to do a survey once a week and will collect data about the following:

We are looking for information that will help us understand problems you encounter with Windows, how you have configured your computer and Windows, what hardware you are using, and general information about how you are using Windows and Microsoft Office products on your computer.

Microsoft will basically be collecting all sorts of information, including hardware details, Control Panel settings, file and folder information and usage statistics for Windows and Office as well any problems you encounter with them. So if you value your privacy less than a copy of Windows Vista, this could be for you. Or perhaps you could just install it on a secondary system and get a free piece of software for that?!

Update: Apparently Microsoft has already had too many people register, so it's reached its limit for free software giveaways. You can still register for the program, but you won't receive anything in return.