I'd like to share with you interesting service that google made available for use recently. It's still in google lab but it's working very well already.Check out: www.google.com/trends
It allows you to see popularity of search keywords over time in Google. It can be one keyword but can be also multiple keyword. Do you want to check popularity of your favorite beer brands, cars, pop stars? This is good place where you can quickly start. See screenshot here comparing bmw (blue on the chart) with audi (red).
For more serious usage - it allows you to compare various ways on how people search for your products and services. Are people searching in singular form, or plural - are they search for notebook, notebooks or maybe laptop or laptops... This can help you to decide on how to name your products on your website and also on what keyword to buy in your SEM campaign. Enjoy!
