Last June, Google introduced a new research and media measurement tool dubbed Ad Planner which we suspected uses the Google Toolbar to collect data. Today, the company is opening up Ad Planner for anyone with a Google account and adding a bunch of features.

Google Ad Planner now support search queries (surprise!) and geo-targeting, which means you can drill-down to specific states or metros (region or cities in geographies outside the US). You can also choose among three new ranking methods to display results from the sites you’re considering running your campaigns on, and there’s also a new interactive ‘bubble chart’ which should help you compare demographics, frequency, traffic, and unique visitors visually.

Google has also expanded demographic audience data to include France, Germany, Italy, Spain, and the UK.

To use the service, go to the Ad Planner Homepage and login with your Google account.