Google has recently changed how you can use the Google Keyword Planner. Before, everyone who signed up could see the search volume for keywords. Now, it only shows estimates. There is a way to get around this. You need to create a Google Adwords campaign. The amount you spend doesn’t matter. After you do that, you will regain access to the search volume.
Nice work Laura! This is going to be a great series. I'm working my way through SEOmoz's Advanced SEO Training Series (videos) Vol. 1 & 2 to build upon the advice and guidance that you and your team provided to me during my time at Yahoo!. Now many others will benefit from your knowledge, experience and passion for SEO strategy and tactics. Best wishes for great success in your new role.