Since Microsoft does not provide any easy way of access to your applications marketplace reviews yet i built a little silverlight app doing just that. It shows all reviews on your application from marketplaces around the world. Just enter your Product/Application ID (can be found on the details page in the app hub), select one of the marketplaces where your app is published and hit Go! Haven't got an app yet? Check out the reviews for Bejeweled
Get in touch with your WP7 App Reviewers
WP7 Review Reader – Status update & CSV Export
Windows Phone 7 Review Reader