[niknikson]

Google AdWords campaign is good way to gauge market demand. Key is to identify granular high intent keywords in your market and setup your campaign to only target those keywords. If you are able to capture a decent amount of exact keyword search impression you can work backwards to get an idea of overall traffic/demand for your product. Keep in mind if you run a short campaign you will have to take into consideration seasonality - you can likely extrapolate this info by analyzing monthly search volume in AdWords keyword tool.

The other important factor is validating keyword intent. You need identify some action that indicates the likelihood of a user paying for your service. If you can measure that and combine this data with search volume, you will be in a good position to assess your products feasibility.

[FindMySocks]

I've just run a nice unsuccessful Adwords campaign, and I think my lack of knowledge on how to correctly use Adwords, alongside Analytics is where I'm going wrong. Any chance you know of some decent resources / quick-start guides to help understand Adwords and how to use it?