Google Tools
This tool allows you to find out how multiple sites rank for a particular keyword. To enter more sites select a larger number from the '# of websites' field. A website must be entered in each field. The minimum is two site addresses. Then click the 'Go' button. The results show specific pages from the sites you entered with page title and links to the page. They also show the rank of that page in the Google database when that particular keyword is searched for.
Multiple Domain Keyword Ranking Checker